Quarterly report pursuant to Section 13 or 15(d)

Consolidated Schedule of Investments

v3.22.2.2
Consolidated Schedule of Investments - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Schedule of Investments [Line Items]      
Cost $ 3,689,627 $ 3,259,246 [1],[2],[3] $ 3,689,627 [1],[4],[5]
Fair value $ 3,973,490 $ 3,561,831 [1],[2],[6] 3,973,490 [1],[4],[7]
Investment owned, percent of net assets 200.70% 199.20%  
Analytical Systems Keco Holdings, LLC      
Schedule of Investments [Line Items]      
Cost $ 10,535 $ 10,679  
Fair value 8,436 9,630  
ASC Interests, LLC      
Schedule of Investments [Line Items]      
Cost 3,448 3,336  
Fair value 2,748 2,556  
ATS Workholding, LLC      
Schedule of Investments [Line Items]      
Cost 8,442 [8] 8,361 [9]  
Fair value 2,098 [8] 3,005 [9]  
Barfly Ventures, LLC      
Schedule of Investments [Line Items]      
Cost 2,295 [8] 2,295 [9]  
Fair value 4,031 [8] 2,641 [9]  
Batjer TopCo, LLC      
Schedule of Investments [Line Items]      
Cost 15,014    
Fair value 15,014    
Bolder Panther Group, LLC      
Schedule of Investments [Line Items]      
Cost 112,615 62,881  
Fair value 126,204 72,364  
Brewer Crane Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 10,364 12,317  
Fair value 11,754 15,747  
Bridge Capital Solutions Corporation      
Schedule of Investments [Line Items]      
Cost 12,945 12,945  
Fair value 15,073 14,873  
California Splendor Holdings LLC      
Schedule of Investments [Line Items]      
Cost 42,576 48,200  
Fair value 52,878 50,700  
Centre Technologies Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 21,069 15,210  
Fair value 23,107 14,704  
Chamberlin Holding LLC      
Schedule of Investments [Line Items]      
Cost 30,651 30,500  
Fair value 41,787 43,497  
Charps, LLC      
Schedule of Investments [Line Items]      
Cost 6,598 6,562  
Fair value 18,904 19,684  
Clad-Rex Steel, LLC      
Schedule of Investments [Line Items]      
Cost 18,967 18,962  
Fair value 21,577 22,252  
Cody Pools, Inc.      
Schedule of Investments [Line Items]      
Cost 49,230 50,434  
Fair value 98,424 90,124  
Colonial Electric Company LLC      
Schedule of Investments [Line Items]      
Cost 31,131 32,031  
Fair value 32,661 33,481  
CompareNetworks Topco, LLC      
Schedule of Investments [Line Items]      
Cost 7,314 8,427  
Fair value 23,920 18,477  
Datacom, LLC      
Schedule of Investments [Line Items]      
Cost 11,050 10,906  
Fair value 10,642 10,278  
Digital Products Holdings LLC      
Schedule of Investments [Line Items]      
Cost 25,345 26,302  
Fair value 25,679 26,636  
Direct Marketing Solutions, Inc.      
Schedule of Investments [Line Items]      
Cost 34,752 32,311  
Fair value 48,670 42,398  
Flame King Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 38,963 37,720  
Fair value 42,640 37,720  
Gamber-Johnson Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 41,711 39,227  
Fair value 70,548 71,298  
Garreco, LLC      
Schedule of Investments [Line Items]      
Cost 5,026 5,396  
Fair value 5,816 6,466  
GRT Rubber Technologies LLC      
Schedule of Investments [Line Items]      
Cost 53,366 51,737  
Fair value 86,683 85,075  
Gulf Publishing Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 11,681 17,503  
Fair value 6,204 9,974  
Harris Preston Fund Investments      
Schedule of Investments [Line Items]      
Cost [10],[11] 4,139    
Fair value [10],[11] 7,386    
Jensen Jewelers of Idaho, LLC      
Schedule of Investments [Line Items]      
Cost 3,253 3,347  
Fair value 17,420 14,970  
Johnson Downie Opco, LLC      
Schedule of Investments [Line Items]      
Cost 13,050 14,494  
Fair value 15,864 14,494  
JorVet Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 36,160    
Fair value 36,160    
Kickhaefer Manufacturing Company, LLC      
Schedule of Investments [Line Items]      
Cost 37,444 37,432  
Fair value 35,922 38,970  
Market Force Information, LLC      
Schedule of Investments [Line Items]      
Cost 47,594 45,994  
Fair value 7,871 12,336  
MH Corbin Holding LLC      
Schedule of Investments [Line Items]      
Cost 16,636 18,641  
Fair value 2,709 5,934  
MS Private Loan Fund I, LP      
Schedule of Investments [Line Items]      
Cost 14,250 [10],[11] 65,651 [12],[13]  
Fair value 14,351 [10],[11] 65,732 [12],[13]  
Mystic Logistics Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 8,466 9,097  
Fair value 26,446 15,218  
Nebraska Vet AcquireCo, LLC      
Schedule of Investments [Line Items]      
Cost 35,576 22,228  
Fair value 36,481 22,941  
NexRev LLC      
Schedule of Investments [Line Items]      
Cost 20,483 23,053  
Fair value 10,323 16,735  
NRP Jones, LLC      
Schedule of Investments [Line Items]      
Cost 5,797 5,797  
Fair value 6,870 8,520  
NuStep, LLC      
Schedule of Investments [Line Items]      
Cost 33,010 29,156  
Fair value 33,010 32,460  
OMi Topco, LLC      
Schedule of Investments [Line Items]      
Cost 17,202 18,911  
Fair value 36,930 38,210  
Orttech Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 33,417 34,151  
Fair value 33,417 34,151  
Pearl Meyer Topco LLC      
Schedule of Investments [Line Items]      
Cost 41,521 45,438  
Fair value 70,501 59,644  
PPL RVs, Inc.      
Schedule of Investments [Line Items]      
Cost 21,714 14,531  
Fair value 39,313 26,741  
Principle Environmental, LLC      
Schedule of Investments [Line Items]      
Cost 12,709 14,182  
Fair value 18,820 19,143  
Robbins Bros. Jewelry, Inc.      
Schedule of Investments [Line Items]      
Cost 46,641 47,026  
Fair value 50,781 47,026  
Tedder Industries, LLC      
Schedule of Investments [Line Items]      
Cost 26,096 24,760  
Fair value 24,094 24,760  
Televerde, LLC      
Schedule of Investments [Line Items]      
Cost 2,008    
Fair value 6,998    
Trantech Radiator Topco, LLC      
Schedule of Investments [Line Items]      
Cost 12,938 13,318  
Fair value 15,735 17,372  
VVS Holdco LLC      
Schedule of Investments [Line Items]      
Cost 42,757 43,110  
Fair value 42,997 43,109  
Ziegler’s NYPD, LLC      
Schedule of Investments [Line Items]      
Cost 7,634 7,809  
Fair value 5,316 6,505  
AAC Holdings, Inc.      
Schedule of Investments [Line Items]      
Cost 14,199 [14] 13,159 [15]  
Fair value 11,126 [14] 13,813 [15]  
ATX Networks Corp.      
Schedule of Investments [Line Items]      
Cost 8,509 [14] 9,055 [15]  
Fair value 9,172 [14] 9,055 [15]  
BBB Tank Services, LLC      
Schedule of Investments [Line Items]      
Cost 5,762 5,762  
Fair value 2,298 2,508  
Boccella Precast Products LLC      
Schedule of Investments [Line Items]      
Cost 2,576 2,576  
Fair value 3,640 5,150  
Buca C, LLC      
Schedule of Investments [Line Items]      
Cost 22,295 24,261  
Fair value 14,006 14,370  
Career Team Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 24,580 24,550  
Fair value 24,580 24,550  
Classic H&G Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 32,691 28,899  
Fair value 50,824 38,534  
DMA Industries, LLC      
Schedule of Investments [Line Items]      
Cost 26,969 26,937  
Fair value 28,460 26,937  
Dos Rios Partners      
Schedule of Investments [Line Items]      
Cost 8,702 [10],[11] 8,702 [12],[13]  
Fair value 12,098 [10],[11] 13,609 [12],[13]  
Freeport Financial Funds      
Schedule of Investments [Line Items]      
Cost 10,694 [10],[11] 13,603 [12],[13]  
Fair value 10,291 [10],[11] 13,309 [12],[13]  
GFG Group, LLC.      
Schedule of Investments [Line Items]      
Cost 16,561 17,335  
Fair value 18,885 19,535  
Harris Preston Fund Investments      
Schedule of Investments [Line Items]      
Cost [10],[11] 5,854    
Fair value [10],[11] 7,627    
Hawk Ridge Systems, LLC      
Schedule of Investments [Line Items]      
Cost 43,857 40,257 [13]  
Fair value 61,062 52,835 [13]  
Houston Plating and Coatings, LLC      
Schedule of Investments [Line Items]      
Cost 5,352 5,352  
Fair value 4,970 6,170  
Iron-Main Investments, LLC      
Schedule of Investments [Line Items]      
Cost 38,315 38,274  
Fair value 38,315 38,274  
OnAsset Intelligence, Inc.      
Schedule of Investments [Line Items]      
Cost 12,575 12,322  
Fair value 6,265 8,422  
Oneliance, LLC      
Schedule of Investments [Line Items]      
Cost 6,612 6,603  
Fair value 6,612 6,603  
Rocaceia, LLC (Quality Lease and Rental Holdings, LLC)      
Schedule of Investments [Line Items]      
Cost 32,365 32,365  
Fair value 0 0  
SI East, LLC      
Schedule of Investments [Line Items]      
Cost 96,592 66,956  
Fair value 110,436 77,420  
Slick Innovations, LLC      
Schedule of Investments [Line Items]      
Cost 5,090 6,129  
Fair value 6,320 7,230  
Sonic Systems International, LLC      
Schedule of Investments [Line Items]      
Cost 16,866 [8] 12,827 [9]  
Fair value 17,033 [8] 12,827 [9]  
Superior Rigging & Erecting Co.      
Schedule of Investments [Line Items]      
Cost 25,867 25,832  
Fair value 25,867 25,832  
The Affiliati Network, LLC      
Schedule of Investments [Line Items]      
Cost 17,534 19,496  
Fair value 17,534 19,496  
UniTek Global Services, Inc.      
Schedule of Investments [Line Items]      
Cost 20,324 [14] 19,103 [15]  
Fair value 10,836 [14] 8,929 [15]  
Universal Wellhead Services Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 5,032 [8] 5,032 [9]  
Fair value 0 [8] 0 [9]  
Volusion, LLC      
Schedule of Investments [Line Items]      
Cost 33,719 34,419  
Fair value 17,039 23,833  
AB Centers Acquisition Corporation      
Schedule of Investments [Line Items]      
Cost [8] 16,459    
Fair value [8] 16,459    
Acousti Engineering Company of Florida      
Schedule of Investments [Line Items]      
Cost 12,433 [8] 12,846 [9]  
Fair value 12,425 [8] 12,961 [9]  
Acumera, Inc.      
Schedule of Investments [Line Items]      
Cost [8] 17,753    
Fair value [8] 18,041    
Adams Publishing Group, LLC      
Schedule of Investments [Line Items]      
Cost [8] 27,792    
Fair value [8] 27,206    
AMEREQUIP LLC.      
Schedule of Investments [Line Items]      
Cost [8] 38,420    
Fair value [8] 38,420    
American Health Staffing Group, Inc.      
Schedule of Investments [Line Items]      
Cost [8] 6,567    
Fair value [8] 6,622    
American Nuts, LLC      
Schedule of Investments [Line Items]      
Cost [8] 30,860    
Fair value [8] 30,594    
American Teleconferencing Services, Ltd.      
Schedule of Investments [Line Items]      
Cost 16,686 [14] 16,686 [15]  
Fair value 976 [14] 520 [15]  
ArborWorks, LLC      
Schedule of Investments [Line Items]      
Cost 34,027 [8] 32,107 [9]  
Fair value 30,390 [8] 32,107 [9]  
Archer Systems, LLC      
Schedule of Investments [Line Items]      
Cost [8] 68,329    
Fair value [8] 68,329    
ATS Operating, LLC      
Schedule of Investments [Line Items]      
Cost [8] 14,040    
Fair value [8] 13,464    
AVEX Aviation Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 12,963 [8] 13,365 [9]  
Fair value 12,389 [8] 13,365 [9]  
Berry Aviation, Inc.      
Schedule of Investments [Line Items]      
Cost 2,529 [8] 6,513 [9]  
Fair value 5,179 [8] 7,389 [9]  
Bettercloud, Inc.      
Schedule of Investments [Line Items]      
Cost [8] 26,379    
Fair value [8] 26,886    
Bluestem Brands, Inc.      
Schedule of Investments [Line Items]      
Cost 6,304 [14] 5,358 [15]  
Fair value 11,638 [14] 6,852 [15]  
Brainworks Software, LLC      
Schedule of Investments [Line Items]      
Cost [8] 7,817    
Fair value [8] 4,201    
Brightwood Capital Fund Investments      
Schedule of Investments [Line Items]      
Cost 13,412 [10],[11] 11,550 [12],[13]  
Fair value 11,180 [10],[11] 8,663 [12],[13]  
Burning Glass Intermediate Holding Company, Inc.      
Schedule of Investments [Line Items]      
Cost 20,233 [8] 20,232 [9]  
Fair value 20,553 [8] 20,414 [9]  
CAI Software LLC      
Schedule of Investments [Line Items]      
Cost 1,789 1,789  
Fair value 1,789 1,789  
CaseWorthy, Inc.      
Schedule of Investments [Line Items]      
Cost [8] 6,065    
Fair value [8] 5,988    
Channel Partners Intermediateco, LLC      
Schedule of Investments [Line Items]      
Cost [8] 43,537    
Fair value [8] 42,236    
Computer Data Source, LLC      
Schedule of Investments [Line Items]      
Cost [8] 23,287    
Fair value [8] 21,379    
Dalton US Inc.      
Schedule of Investments [Line Items]      
Cost [8] 14,764    
Fair value [8] 14,764    
DTE Enterprises, LLC      
Schedule of Investments [Line Items]      
Cost 9,709 [8] 11,086 [9]  
Fair value 8,886 [8] 10,255 [9]  
Dynamic Communities, LLC      
Schedule of Investments [Line Items]      
Cost [8] 5,582    
Fair value [8] 4,415    
Eastern Wholesale Fence LLC      
Schedule of Investments [Line Items]      
Cost [8] 32,667    
Fair value [8] 32,234    
EnCap Energy Fund Investments      
Schedule of Investments [Line Items]      
Cost 29,029 [10],[11] 30,996 [12],[13]  
Fair value 22,200 [10],[11] 20,796 [12],[13]  
Centre Technologies Holdings, LLC      
Schedule of Investments [Line Items]      
Cost [8] 16,106    
Fair value [8] 15,888    
Event Holdco, LLC      
Schedule of Investments [Line Items]      
Cost [8] 47,594    
Fair value [8] 43,769    
Flip Electronics LLC      
Schedule of Investments [Line Items]      
Cost [8] 6,569    
Fair value [8] 6,569    
Fuse, LLC      
Schedule of Investments [Line Items]      
Cost 2,066 [14] 2,066 [15]  
Fair value 1,512 [14] 1,672 [15]  
GS HVAM Intermediate, LLC      
Schedule of Investments [Line Items]      
Cost [8] 13,077    
Fair value [8] 12,775    
GULF PACIFIC ACQUISITION, LLC      
Schedule of Investments [Line Items]      
Cost [8] 3,553    
Fair value [8] 3,553    
HDC/HW Intermediate Holdings      
Schedule of Investments [Line Items]      
Cost [8] 3,419    
Fair value [8] 3,185    
HEADLANDS OP-CO LLC      
Schedule of Investments [Line Items]      
Cost [8] 16,419    
Fair value [8] 16,419    
IG Parent Corporation      
Schedule of Investments [Line Items]      
Cost [14] 14,740    
Fair value [14] 14,714    
Independent Pet Partners Intermediate Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 29,288 [8] 28,217 [9]  
Fair value 20,250 [8] 27,753 [9]  
Industrial Services Acquisition, LLC      
Schedule of Investments [Line Items]      
Cost 20,528 [8] 20,591 [9]  
Fair value 20,703 [8] 20,483 [9]  
Infolinks Media Buyco, LLC      
Schedule of Investments [Line Items]      
Cost [8] 8,475    
Fair value [8] 8,523    
Interface Security Systems, L.L.C      
Schedule of Investments [Line Items]      
Cost 8,635 [8] 7,762 [9]  
Fair value 2,947 [8] 5,758 [9]  
Invincible Boat Company, LLC.      
Schedule of Investments [Line Items]      
Cost [8] 17,495    
Fair value [8] 17,361    
Jackmont Hospitality, Inc.      
Schedule of Investments [Line Items]      
Cost 2,200 [8] 2,414 [9]  
Fair value 2,603 [8] 2,414 [9]  
Joerns Healthcare, LLC      
Schedule of Investments [Line Items]      
Cost 10,259 [14] 9,422 [15]  
Fair value 3,055 [14] 4,662 [15]  
JTI Electrical & Mechanical, LLC      
Schedule of Investments [Line Items]      
Cost 38,329 [8] 38,656 [9]  
Fair value 39,518 [8] 38,656 [9]  
KMS, LLC      
Schedule of Investments [Line Items]      
Cost [8] 8,428    
Fair value [8] 8,115    
LL Management, Inc.      
Schedule of Investments [Line Items]      
Cost [8] 28,001    
Fair value [8] 28,145    
Mac Lean-Fogg Company      
Schedule of Investments [Line Items]      
Cost 18,865 [8] 18,915 [9]  
Fair value 18,705 [8] 19,000 [9]  
Mako Steel, LP      
Schedule of Investments [Line Items]      
Cost [8] 16,706    
Fair value [8] 16,377    
MB2 Dental Solutions, LLC      
Schedule of Investments [Line Items]      
Cost [14] 14,556    
Fair value [14] 14,597    
Microbe Formulas, LLC      
Schedule of Investments [Line Items]      
Cost [8] 27,052    
Fair value [8] 25,599    
MonitorUS Holding, LLC      
Schedule of Investments [Line Items]      
Cost [8],[11],[16] 27,463    
Fair value [8],[11],[16] 27,306    
NinjaTrader, LLC      
Schedule of Investments [Line Items]      
Cost [8] 21,342    
Fair value [8] 21,623    
NWN Corporation      
Schedule of Investments [Line Items]      
Cost [8] 43,846    
Fair value [8] 42,000    
Paragon Healthcare, Inc.      
Schedule of Investments [Line Items]      
Cost [8] 19,237    
Fair value [8] 18,753    
Project Eagle Holdings, LLC      
Schedule of Investments [Line Items]      
Cost [8] 29,063    
Fair value [8] 28,811    
PTL US Bidco, Inc      
Schedule of Investments [Line Items]      
Cost [8] 27,890    
Fair value [8] 27,890    
RA Outdoors LLC      
Schedule of Investments [Line Items]      
Cost [8] 13,219    
Fair value [8] 12,240    
RM Bidder, LLC      
Schedule of Investments [Line Items]      
Cost 471 [8] 471 [9]  
Fair value 24 [8] 26 [9]  
Roof Opco, LLC      
Schedule of Investments [Line Items]      
Cost [8] 5,398    
Fair value [8] 5,345    
RTIC Subsidiary Holdings, LLC      
Schedule of Investments [Line Items]      
Cost [8] 19,222    
Fair value [8] 18,479    
Rug Doctor, LLC.      
Schedule of Investments [Line Items]      
Cost [8] 13,792    
Fair value [8] 12,495    
Salient Partners L.P.      
Schedule of Investments [Line Items]      
Cost 7,500 [14] 7,497 [15]  
Fair value 7,533 [14] 6,498 [15]  
SIB Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 9,771 [8] 6,334 [9]  
Fair value 9,187 [8] 6,345 [9]  
South Coast Terminals Holdings, LLC      
Schedule of Investments [Line Items]      
Cost 41,453 [8] 50,453 [9]  
Fair value 41,765 [8] 50,453 [9]  
SPAU Holdings, LLC      
Schedule of Investments [Line Items]      
Cost [8] 16,242    
Fair value [8] 16,242    
Student Resource Center, LLC      
Schedule of Investments [Line Items]      
Cost [8] 10,416    
Fair value [8] 6,416    
Veregy Consolidated, Inc.      
Schedule of Investments [Line Items]      
Cost 16,680 [14] 19,635 [15]  
Fair value 16,160 [14] 20,036 [15]  
VORTEQ Coil Finishers, LLC      
Schedule of Investments [Line Items]      
Cost 26,087 [8] 26,488 [9]  
Fair value 28,485 [8] 26,488 [9]  
Wall Street Prep, Inc.      
Schedule of Investments [Line Items]      
Cost 4,617 [8] 4,688 [9]  
Fair value 4,376 [8] 4,685 [9]  
Watterson Brands, LLC      
Schedule of Investments [Line Items]      
Cost [8] 29,259    
Fair value [8] 28,794    
West Star Aviation Acquisition, LLC      
Schedule of Investments [Line Items]      
Cost [8] 12,119    
Fair value [8] 11,893    
Winter Services LLC      
Schedule of Investments [Line Items]      
Cost [8] 9,780    
Fair value [8] 9,665    
Xenon Arc, Inc.      
Schedule of Investments [Line Items]      
Cost [8] 37,316    
Fair value [8] 36,501    
Zips Car Wash, LLC      
Schedule of Investments [Line Items]      
Cost [8] 21,583    
Fair value [8] 21,573    
AFG Capital Group, LLC      
Schedule of Investments [Line Items]      
Cost   1,344  
Fair value   7,884  
L.F. Manufacturing Holdings, LLC      
Schedule of Investments [Line Items]      
Cost   2,126  
Fair value   2,664  
Binswanger Enterprises, LLC      
Schedule of Investments [Line Items]      
Cost [9]   13,157  
Fair value [9]   12,924  
Darr Equipment LP      
Schedule of Investments [Line Items]      
Cost [9]   5,159  
Fair value [9]   4,387  
Grupo Hima San Pablo, Inc.      
Schedule of Investments [Line Items]      
Cost [15]   6,691  
Fair value [15]   1,465  
PT Network, LLC      
Schedule of Investments [Line Items]      
Cost [9]   8,889  
Fair value [9]   8,969  
Control investments      
Schedule of Investments [Line Items]      
Cost [17] 1,199,446 [5] 1,107,597 [3]  
Fair value [17] $ 1,599,429 [7] $ 1,489,257 [6]  
Investment owned, percent of net assets 80.80% 83.30%  
Affiliate investments      
Schedule of Investments [Line Items]      
Cost $ 576,047 [5] $ 578,539 [3],[18]  
Fair value $ 552,581 [7] $ 549,214 [6],[18]  
Investment owned, percent of net assets 27.90% 30.70%  
Non‑Control/Non‑Affiliate investments      
Schedule of Investments [Line Items]      
Cost $ 1,914,134 $ 1,573,110 [3],[19] 1,914,134 [5]
Fair value $ 1,821,480 $ 1,523,360 [6],[19] $ 1,821,480 [7]
Investment owned, percent of net assets 92.00% 85.20%  
Investment, Identifier [Axis]: Dalton US Inc., Common Stock August 16, 2022      
Schedule of Investments [Line Items]      
Units (in shares) [8] 201    
Cost [8] $ 201    
Fair value [8] $ 201    
Investment, Identifier [Axis]: Dalton US Inc., Secured Debt One August 16, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 11.13%    
Interest, variable rate [8],[20],[21] 8.00%    
Principal [8],[20],[21] $ 763    
Cost [8],[20],[21] 530    
Fair value [8],[20],[21] $ 530    
Investment, Identifier [Axis]: Dalton US Inc., Secured Debt Three August 16, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 11.31%    
Interest, variable rate [8],[20],[21] 8.00%    
Principal [8],[20],[21] $ 14,389    
Cost [8],[20],[21] 14,111    
Fair value [8],[20],[21] $ 14,111    
Investment, Identifier [Axis]: Dalton US Inc., Secured Debt Two August 16, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 8.00%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (78)    
Fair value [8],[20],[21],[22] $ (78)    
Investment, Identifier [Axis]: Salient Partners L.P., Secured Debt September 30,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.00%  
Interest, variable rate [15],[23]   5.00%  
Principal [15],[23]   $ 1,250  
Cost [15],[23]   1,250  
Fair value [15],[23]   $ 2,435  
Investment, Identifier [Axis]: Winter Services LLC, Secured Debt November 19,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.00%  
Interest, variable rate [9],[23]   7.00%  
Principal [9],[23]   $ 10,278  
Cost [9],[23]   10,018  
Fair value [9],[23]   $ 10,061  
Investment, Identifier [Axis]: AAC Holdings, Inc., Common Stock December 11, 2020      
Schedule of Investments [Line Items]      
Units (in shares) [14] 593,928    
Cost [14] $ 3,148    
Fair value [14] $ 75    
Investment, Identifier [Axis]: AAC Holdings, Inc., Common Stock December 11,2020      
Schedule of Investments [Line Items]      
Units (in shares) [15]   593,928  
Cost [15]   $ 3,148  
Fair value [15]   $ 2,079  
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt December 11, 2020      
Schedule of Investments [Line Items]      
Interest rate [14] 18.00%    
PIK Rate [14] 18.00%    
Principal [14] $ 11,200    
Cost [14] 11,051    
Fair value [14] $ 10,976    
Investment, Identifier [Axis]: AAC Holdings, Inc., Secured Debt December 11,2020      
Schedule of Investments [Line Items]      
Interest rate [15]   18.00%  
PIK Rate [15]   8.00%  
Principal [15]   $ 10,202  
Cost [15]   10,011  
Fair value [15]   $ 9,794  
Investment, Identifier [Axis]: AAC Holdings, Inc., Warrants December 11, 2020      
Schedule of Investments [Line Items]      
Units (in shares) [14],[24] 554,353    
Cost [14],[24] $ 0    
Fair value [14],[24] $ 75    
Investment, Identifier [Axis]: AAC Holdings, Inc., Warrants December 11,2020      
Schedule of Investments [Line Items]      
Units (in shares) [15],[25]   554,353  
Cost [15],[25]   $ 0  
Fair value [15],[25]   $ 1,940  
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt One September 06, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 6.00%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (41)    
Fair value [8],[20],[21],[22] $ (41)    
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt Three September 06, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.17%    
Interest, variable rate [8],[20],[21] 6.00%    
Principal [8],[20],[21] $ 17,052    
Cost [8],[20],[21] 16,582    
Fair value [8],[20],[21] $ 16,582    
Investment, Identifier [Axis]: AB Centers Acquisition Corporation, Secured Debt Two September 06, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 6.00%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (82)    
Fair value [8],[20],[21],[22] $ (82)    
Investment, Identifier [Axis]: ADS Tactical, Inc. Secured Debt March 29, 2021      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 8.80%    
Interest, variable rate [14],[21] 5.75%    
Principal [14],[21] $ 21,286    
Cost [14],[21] 20,964    
Fair value [14],[21] $ 19,676    
Investment, Identifier [Axis]: ADS Tactical, Inc., Secured Debt March 29,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.75%  
Interest, variable rate [15],[23]   5.75%  
Principal [15],[23]   $ 22,136  
Cost [15],[23]   21,734  
Fair value [15],[23]   $ 22,012  
Investment, Identifier [Axis]: AFG Capital Group, LLC, Preferred Member Units November 07, 2014      
Schedule of Investments [Line Items]      
Units (in shares) [26] 186    
Cost [26] $ 1,200    
Fair value [26] $ 8,780    
Investment, Identifier [Axis]: AFG Capital Group, LLC, Preferred Member Units November 07,2014      
Schedule of Investments [Line Items]      
Units (in shares) [27]   186  
Cost [27]   $ 1,200  
Fair value [27]   $ 7,740  
Investment, Identifier [Axis]: AFG Capital Group, LLC, Secured Debt April 25,2019      
Schedule of Investments [Line Items]      
Interest rate   10.00%  
Principal   $ 144  
Cost   144  
Fair value   $ 144  
Investment, Identifier [Axis]: AMEREQUIP LLC., Common Stock August 31, 2022      
Schedule of Investments [Line Items]      
Units (in shares) [8] 235    
Cost [8] $ 1,734    
Fair value [8] $ 1,734    
Investment, Identifier [Axis]: AMEREQUIP LLC., Secured Debt One August 31, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 7.40%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (144)    
Fair value [8],[20],[21],[22] $ (144)    
Investment, Identifier [Axis]: AMEREQUIP LLC., Secured Debt Two August 31, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.84%    
Interest, variable rate [8],[20],[21] 7.40%    
Principal [8],[20],[21] $ 37,545    
Cost [8],[20],[21] 36,830    
Fair value [8],[20],[21] $ 36,830    
Investment, Identifier [Axis]: ASC Interests, LLC, Member Units August 1,2013      
Schedule of Investments [Line Items]      
Units (in shares) 1,500 1,500  
Cost $ 1,500 $ 1,500  
Fair value $ 800 $ 720  
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt August 1,2013      
Schedule of Investments [Line Items]      
Interest rate   13.00%  
Principal   $ 1,650  
Cost   1,636  
Fair value   $ 1,636  
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt December 31,2019      
Schedule of Investments [Line Items]      
Interest rate   13.00%  
Principal   $ 200  
Cost   200  
Fair value   $ 200  
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt One December 31,2019      
Schedule of Investments [Line Items]      
Interest rate 13.00%    
Principal $ 300    
Cost 300    
Fair value $ 300    
Investment, Identifier [Axis]: ASC Interests, LLC, Secured Debt Two August 1,2013      
Schedule of Investments [Line Items]      
Interest rate 13.00%    
Principal $ 1,650    
Cost 1,648    
Fair value $ 1,648    
Investment, Identifier [Axis]: ATS Operating, LLC, Common Stock January 18,2022.      
Schedule of Investments [Line Items]      
Units (in shares) [8] 720,000    
Cost [8] $ 720    
Fair value [8] $ 720    
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt One January 18,2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 6.50%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] 0    
Fair value [8],[20],[21],[22] $ 0    
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt Three January 18,2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.84%    
Interest, variable rate [8],[20],[21] 7.50%    
Principal [8],[20],[21] $ 6,660    
Cost [8],[20],[21] 6,660    
Fair value [8],[20],[21] $ 6,384    
Investment, Identifier [Axis]: ATS Operating, LLC, Secured Debt Two January 18,2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 7.84%    
Interest, variable rate [8],[20],[21] 5.50%    
Principal [8],[20],[21] $ 6,660    
Cost [8],[20],[21] 6,660    
Fair value [8],[20],[21] $ 6,360    
Investment, Identifier [Axis]: ATS Workholding, LLC, Preferred Member Units November 16,2017      
Schedule of Investments [Line Items]      
Units (in shares) 3,725,862 [8] 3,725,862 [9]  
Cost $ 3,726 [8] $ 3,726 [9]  
Fair value $ 0 [8] $ 0 [9]  
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt November 16,2017      
Schedule of Investments [Line Items]      
Interest rate [9],[28]   5.00%  
Principal [9],[28]   $ 4,794  
Cost [9],[28]   4,635  
Fair value [9],[28]   $ 3,005  
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt One November 16,2017      
Schedule of Investments [Line Items]      
Interest rate [8],[29] 5.00%    
Principal [8],[29] $ 1,859    
Cost [8],[29] 1,859    
Fair value [8],[29] $ 800    
Investment, Identifier [Axis]: ATS Workholding, LLC, Secured Debt Two November 16,2017      
Schedule of Investments [Line Items]      
Interest rate [8],[29] 5.00%    
Principal [8],[29] $ 3,015    
Cost [8],[29] 2,857    
Fair value [8],[29] $ 1,298    
Investment, Identifier [Axis]: ATX Networks Corp., Common Stock September 01, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [14] 583    
Cost [14] $ 0    
Fair value [14] $ 0    
Investment, Identifier [Axis]: ATX Networks Corp., Common Stock September 01,2021      
Schedule of Investments [Line Items]      
Units (in shares) [15]   583  
Cost [15]   $ 0  
Fair value [15]   $ 0  
Investment, Identifier [Axis]: ATX Networks Corp., Secured Debt September 01, 2021      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 11.14%    
Interest, variable rate [14],[21] 7.50%    
Principal [14],[21] $ 6,879    
Cost [14],[21] 6,304    
Fair value [14],[21] $ 6,707    
Investment, Identifier [Axis]: ATX Networks Corp., Secured Debt September 01,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   8.50%  
Interest, variable rate [15],[23]   7.50%  
Principal [15],[23]   $ 7,667  
Cost [15],[23]   7,092  
Fair value [15],[23]   $ 7,092  
Investment, Identifier [Axis]: ATX Networks Corp., Unsecured Debt September 01, 2021      
Schedule of Investments [Line Items]      
Interest rate [14] 10.00%    
PIK Rate [14] 10.00%    
Principal [14] $ 3,309    
Cost [14] 2,205    
Fair value [14] $ 2,465    
Investment, Identifier [Axis]: ATX Networks Corp., Unsecured Debt September 01,2021      
Schedule of Investments [Line Items]      
Interest rate [15]   10.00%  
PIK Rate [15]   10.00%  
Principal [15]   $ 3,067  
Cost [15]   1,963  
Fair value [15]   $ 1,963  
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Common Equity December 15,2021      
Schedule of Investments [Line Items]      
Units (in shares) [9]   360  
Cost [9]   $ 360  
Fair value [9]   $ 360  
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Common Equity Two December 15, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [8] 360    
Cost [8] $ 360    
Fair value [8] $ 258    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt December 15,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.50%  
Interest, variable rate [9],[23]   6.50%  
Principal [9],[23]   $ 13,320  
Cost [9],[23]   13,005  
Fair value [9],[23]   $ 13,005  
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt One December 15, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.32%    
Interest, variable rate [8],[21] 7.00%    
Principal [8],[21] $ 720    
Cost [8],[21] 659    
Fair value [8],[21] $ 679    
Investment, Identifier [Axis]: AVEX Aviation Holdings, LLC, Secured Debt Two December 15, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.29%    
Interest, variable rate [8],[21] 7.00%    
Principal [8],[21] $ 12,148    
Cost [8],[21] 11,944    
Fair value [8],[21] $ 11,452    
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt May 26,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   14.00%  
Interest, variable rate [9],[23]   12.50%  
Principal [9],[23]   $ 850  
Cost [9],[23]   841  
Fair value [9],[23]   $ 850  
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt November 02,2020      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   10.00%  
Interest, variable rate [9],[23]   8.50%  
Principal [9],[23]   $ 12,111  
Cost [9],[23]   12,005  
Fair value [9],[23]   $ 12,111  
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt One November 02, 2020      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.78%    
Interest, variable rate [8],[21] 8.50%    
Principal [8],[21] $ 1,678    
Cost [8],[21] 1,668    
Fair value [8],[21] $ 1,664    
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt Two November 02, 2020      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.00%    
Interest, variable rate [8],[21] 8.50%    
Principal [8],[21] $ 10,027    
Cost [8],[21] 9,954    
Fair value [8],[21] $ 9,944    
Investment, Identifier [Axis]: Acousti Engineering Company of Florida, Secured Debt Two May 26 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 14.78%    
Interest, variable rate [8],[21] 12.50%    
Principal [8],[21] $ 817    
Cost [8],[21] 811    
Fair value [8],[21] $ 817    
Investment, Identifier [Axis]: Acumera, Inc., Secured Debt One June 28, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 12.02%    
Interest, variable rate [8],[21] 9.50%    
Principal [8],[21] $ 13,831    
Cost [8],[21] 13,488    
Fair value [8],[21] $ 13,711    
Investment, Identifier [Axis]: Acumera, Inc., Secured Debt Two June 28, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 12.02%    
Interest, variable rate [8],[21] 9.50%    
Principal [8],[21] $ 4,368    
Cost [8],[21] 4,265    
Fair value [8],[21] $ 4,330    
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt One March 11, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 12.75%    
Interest, variable rate [8],[21] 6.50%    
Principal [8],[21] $ 3,547    
Cost [8],[21] 3,547    
Fair value [8],[21] $ 3,418    
Investment, Identifier [Axis]: Adams Publishing Group, LLC, Secured Debt Two March 11, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.75%    
Interest, variable rate [8],[21] 7.50%    
Principal [8],[21] $ 24,305    
Cost [8],[21] 24,245    
Fair value [8],[21] $ 23,788    
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt November 19,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.00%  
Interest, variable rate [9],[23]   6.00%  
Principal [9],[23]   $ 7,067  
Cost [9],[23]   6,988  
Fair value [9],[23]   $ 6,988  
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt One November 19, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 7.00%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (11)    
Fair value [8],[21],[22] $ (11)    
Investment, Identifier [Axis]: American Health Staffing Group, Inc., Secured Debt Two November 19, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.01%    
Interest, variable rate [8],[21] 7.00%    
Principal [8],[21] $ 6,633    
Cost [8],[21] 6,578    
Fair value [8],[21] $ 6,633    
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt December 21,2018      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   9.00%  
Interest, variable rate [9],[23]   8.00%  
Principal [9],[23]   $ 12,017  
Cost [9],[23]   11,854  
Fair value [9],[23]   $ 12,017  
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt Two March 11, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 10.98%    
Interest, variable rate [8],[20],[21] 8.75%    
Principal [8],[20],[21] $ 15,667    
Cost [8],[20],[21] 15,430    
Fair value [8],[20],[21] $ 15,307    
Investment, Identifier [Axis]: American Nuts, LLC, Secured Debt one March 11, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 8.98%    
Interest, variable rate [8],[20],[21] 6.75%    
Principal [8],[20],[21] $ 15,667    
Cost [8],[20],[21] 15,430    
Fair value [8],[20],[21] $ 15,287    
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt May 19,2016      
Schedule of Investments [Line Items]      
Interest rate [15],[23],[28]   7.50%  
Interest, variable rate [15],[23],[28]   6.50%  
Principal [15],[23],[28]   $ 14,370  
Cost [15],[23],[28]   13,706  
Fair value [15],[23],[28]   $ 431  
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt One, May 19, 2016      
Schedule of Investments [Line Items]      
Interest rate [14],[21],[29] 7.50%    
Interest, variable rate [14],[21],[29] 6.50%    
Principal [14],[21],[29] $ 14,370    
Cost [14],[21],[29] 13,706    
Fair value [14],[21],[29] $ 808    
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt September 17, 2021      
Schedule of Investments [Line Items]      
Interest rate [14],[29] 7.50%    
Interest, variable rate [14],[29] 6.50%    
Principal [14],[29] $ 2,980    
Cost [14],[29] 2,980    
Fair value [14],[29] $ 168    
Investment, Identifier [Axis]: American Teleconferencing Services, Ltd., Secured Debt September 17,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23],[28],[30]   7.50%  
Interest, variable rate [15],[23],[28],[30]   6.50%  
Principal [15],[23],[28],[30]   $ 2,980  
Cost [15],[23],[28],[30]   2,980  
Fair value [15],[23],[28],[30]   $ 89  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC , Warrants August 16,2019      
Schedule of Investments [Line Items]      
Units (in shares) [25]   420  
Cost [25]   $ 316  
Fair value [25]   $ 0  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units August 16,2019      
Schedule of Investments [Line Items]      
Units (in shares)   3,200  
Cost   $ 3,200  
Fair value   $ 0  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units May 20,2021      
Schedule of Investments [Line Items]      
Units (in shares)   2,427  
Cost   $ 2,427  
Fair value   $ 4,894  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units One August 16, 2019      
Schedule of Investments [Line Items]      
Units (in shares) 3,200    
Interest rate 12.63%    
Cost $ 3,200    
Fair value $ 0    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Preferred Member Units Two May 20,2021      
Schedule of Investments [Line Items]      
Units (in shares) 2,427    
Cost $ 2,427    
Fair value $ 3,844    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt One August 16,2019      
Schedule of Investments [Line Items]      
Interest, variable rate [21],[22] 10.00%    
Principal [21],[22] $ 0    
Cost [21],[22] (3)    
Fair value [21],[22] $ (3)    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt August 16,2019      
Schedule of Investments [Line Items]      
Interest rate [23]   12.00%  
Interest, variable rate [23]   10.00%  
Principal [23]   $ 4,945  
Cost [23]   4,736  
Fair value [23]   $ 4,736  
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Secured Debt Two August 16, 2019      
Schedule of Investments [Line Items]      
Interest rate [21] 12.63%    
Interest, variable rate [21] 10.00%    
Principal [21] $ 4,735    
Cost [21] 4,595    
Fair value [21] $ 4,595    
Investment, Identifier [Axis]: Analytical Systems Keco Holdings, LLC, Warrants August 16,2019      
Schedule of Investments [Line Items]      
Units (in shares) [24] 420    
Cost [24] $ 316    
Fair value [24] $ 0    
Investment, Identifier [Axis]: ArborWorks, LLC Common Equity November 09, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [8] 234    
Cost [8] $ 234    
Fair value [8] $ 14    
Investment, Identifier [Axis]: ArborWorks, LLC, Common Equity November 09,2021      
Schedule of Investments [Line Items]      
Units (in shares) [9]   234  
Cost [9]   $ 234  
Fair value [9]   $ 234  
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt November 09,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.00%  
Interest, variable rate [9],[23]   7.00%  
Principal [9],[23]   $ 32,605  
Cost [9],[23]   31,873  
Fair value [9],[23]   $ 31,873  
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt One November 09, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.97%    
Interest, variable rate [8],[21] 7.00%    
Principal [8],[21] $ 4,678    
Cost [8],[21] 4,562    
Fair value [8],[21] $ 4,131    
Investment, Identifier [Axis]: ArborWorks, LLC, Secured Debt Two November 09, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.87%    
Interest, variable rate [8],[21] 7.00%    
Principal [8],[21] $ 29,722    
Cost [8],[21] 29,231    
Fair value [8],[21] $ 26,245    
Investment, Identifier [Axis]: Archer Systems, LLC, Secured Debt One August 11, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.65%    
Interest, variable rate [8],[20],[21] 6.50%    
Principal [8],[20],[21] $ 800    
Cost [8],[20],[21] 660    
Fair value [8],[20],[21] $ 660    
Investment, Identifier [Axis]: Archer Systems, LLC, Secured Debt Two August 11, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 8.91%    
Interest, variable rate [8],[20],[21] 6.50%    
Principal [8],[20],[21] $ 67,597    
Cost [8],[20],[21] 66,281    
Fair value [8],[20],[21] $ 66,281    
Investment, Identifier [Axis]: Archer Systems, LLC., Common Stock August 11, 2022      
Schedule of Investments [Line Items]      
Units (in shares) [8] 1,387,832    
Cost [8] $ 1,388    
Fair value [8] $ 1,388    
Investment, Identifier [Axis]: Arrow International, Inc, Secured Debt December 21, 2020      
Schedule of Investments [Line Items]      
Interest rate [8],[21],[31] 11.96%    
Interest, variable rate [8],[21],[31] 5.61%    
Principal [8],[21],[31] $ 36,000    
Cost [8],[21],[31] 35,715    
Fair value [8],[21],[31] $ 36,000    
Investment, Identifier [Axis]: Arrow International, Inc, Secured Debt December 21,2020      
Schedule of Investments [Line Items]      
Interest rate [9],[23],[32]   9.18%  
Interest, variable rate [9],[23],[32]   7.93%  
Principal [9],[23],[32]   $ 22,500  
Cost [9],[23],[32]   22,300  
Fair value [9],[23],[32]   $ 22,500  
Investment, Identifier [Axis]: BBB Tank Services, LLC, Member Units April 08, 2016      
Schedule of Investments [Line Items]      
Units (in shares) 800,000    
Cost $ 800    
Fair value $ 0    
Investment, Identifier [Axis]: BBB Tank Services, LLC, Member Units April 08,2016      
Schedule of Investments [Line Items]      
Units (in shares)   800,000  
Cost   $ 800  
Fair value   $ 0  
Investment, Identifier [Axis]: BBB Tank Services, LLC, Preferred Stock (non-voting) December 17, 2018      
Schedule of Investments [Line Items]      
Interest rate 15.00%    
PIK Rate 15.00%    
Cost $ 162    
Fair value $ 0    
Investment, Identifier [Axis]: BBB Tank Services, LLC, Preferred Stock (non-voting) December 17,2018      
Schedule of Investments [Line Items]      
Interest rate [27]   15.00%  
PIK Rate [27]   15.00%  
Cost [27]   $ 162  
Fair value [27]   $ 0  
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt April 08,2016      
Schedule of Investments [Line Items]      
Interest rate [23],[30]   12.00%  
Interest, variable rate [23],[30]   11.00%  
Principal [23],[30]   $ 4,800  
Cost [23],[30]   4,800  
Fair value [23],[30]   $ 2,508  
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt One April 08, 2016      
Schedule of Investments [Line Items]      
Interest rate [21],[33] 13.56%    
Interest, variable rate [21],[33] 11.00%    
Principal [21],[33] $ 800    
Cost [21],[33] 800    
Fair value [21],[33] $ 800    
Investment, Identifier [Axis]: BBB Tank Services, LLC, Unsecured Debt Two April 08, 2016      
Schedule of Investments [Line Items]      
Interest rate [21],[33] 13.56%    
Interest, variable rate [21],[33] 11.00%    
Principal [21],[33] $ 4,000    
Cost [21],[33] 4,000    
Fair value [21],[33] $ 1,498    
Investment, Identifier [Axis]: Barfly Ventures, LLC, Member Units October 26, 2020      
Schedule of Investments [Line Items]      
Units (in shares) [8] 37    
Cost [8] $ 1,584    
Fair value [8] $ 3,320    
Investment, Identifier [Axis]: Barfly Ventures, LLC, Member Units October 26,2020      
Schedule of Investments [Line Items]      
Units (in shares) [9]   37  
Cost [9]   $ 1,584  
Fair value [9]   $ 1,930  
Investment, Identifier [Axis]: Barfly Ventures, LLC, Secured Debt October 15, 2020      
Schedule of Investments [Line Items]      
Interest rate [8] 7.00%    
Principal [8] $ 711    
Cost [8] 711    
Fair value [8] $ 711    
Investment, Identifier [Axis]: Barfly Ventures, LLC, Secured Debt October 15,2020      
Schedule of Investments [Line Items]      
Interest rate [9]   7.00%  
Principal [9]   $ 711  
Cost [9]   711  
Fair value [9]   $ 711  
Investment, Identifier [Axis]: Batjer TopCo, LLC, Preferred Stock March 7,2022      
Schedule of Investments [Line Items]      
Units (in shares) 4,073    
Cost $ 4,095    
Fair value 4,095    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt One March 7,2022      
Schedule of Investments [Line Items]      
Principal [22] 0    
Cost [22] (8)    
Fair value [22] $ (8)    
Investment, Identifier [Axis]: Batjer TopCo, LLC, Secured Debt Three March 7,2022      
Schedule of Investments [Line Items]      
Interest rate 11.00%    
Principal $ 11,025    
Cost 10,927    
Fair value $ 10,927    
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units July 06,2018      
Schedule of Investments [Line Items]      
Units (in shares) [9],[34]   1,548,387  
Interest rate [9],[34]   8.00%  
PIK Rate [9],[34]   8.00%  
Cost [9],[34]   $ 1,671  
Fair value [9],[34]   $ 2,487  
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units November 12,2019      
Schedule of Investments [Line Items]      
Units (in shares) [9],[27],[34]   122,416  
Interest rate [9],[27],[34]   16.00%  
PIK Rate [9],[27],[34]   16.00%  
Cost [9],[27],[34]   $ 168  
Fair value [9],[27],[34]   $ 208  
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units One July 06, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [8],[26],[35] 1,548,387    
Interest rate [8],[26],[35] 8.00%    
PIK Rate [8],[26],[35] 8.00%    
Cost [8],[26],[35] $ 2,147    
Fair value [8],[26],[35] $ 4,607    
Investment, Identifier [Axis]: Berry Aviation, Inc., Preferred Member Units Two November 12, 2019      
Schedule of Investments [Line Items]      
Units (in shares) [8],[26],[35] 122,416    
Interest rate [8],[26],[35] 16.00%    
PIK Rate [8],[26],[35] 16.00%    
Cost [8],[26],[35] $ 188    
Fair value [8],[26],[35] $ 378    
Investment, Identifier [Axis]: Berry Aviation, Inc., Secured Debt July 06, 2018      
Schedule of Investments [Line Items]      
Interest rate [8] 12.00%    
Interest, variable rate [8] 10.50%    
PIK Rate [8] 1.50%    
Principal [8] $ 194    
Cost [8] 194    
Fair value [8] $ 194    
Investment, Identifier [Axis]: Berry Aviation, Inc., Secured Debt July 06,2018      
Schedule of Investments [Line Items]      
Interest rate [9]   12.00%  
PIK Rate [9]   1.50%  
Principal [9]   $ 4,694  
Cost [9]   4,674  
Fair value [9]   $ 4,694  
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt One June 30, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 6.00%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (79)    
Fair value [8],[20],[21],[22] $ (79)    
Investment, Identifier [Axis]: Bettercloud, Inc., Secured Debt Two June 30, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.78%    
Interest, variable rate [8],[20],[21] 6.75%    
PIK Rate [8],[20],[21] 5.75%    
Principal [8],[20],[21] $ 26,965    
Cost [8],[20],[21] 26,458    
Fair value [8],[20],[21] $ 26,965    
Investment, Identifier [Axis]: Binswanger Enterprises, LLC, Member Units March 10, 2017      
Schedule of Investments [Line Items]      
Units (in shares) [8] 1,050,000    
Cost [8] $ 1,050    
Fair value [8] $ 560    
Investment, Identifier [Axis]: Binswanger Enterprises, LLC, Member Units March 10,2017      
Schedule of Investments [Line Items]      
Units (in shares) [9]   1,050,000  
Cost [9]   $ 1,050  
Fair value [9]   $ 730  
Investment, Identifier [Axis]: Binswanger Enterprises, LLC, Secured Debt March 10,2017      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   9.50%  
Interest, variable rate [9],[23]   8.50%  
Principal [9],[23]   $ 12,194  
Cost [9],[23]   12,107  
Fair value [9],[23]   $ 12,194  
Investment, Identifier [Axis]: Bluestem Brands, Inc, Secured Debt August 28, 2020      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 11.29%    
Interest, variable rate [14],[21] 8.50%    
Principal [14],[21] $ 6,303    
Cost [14],[21] 6,303    
Fair value [14],[21] $ 6,193    
Investment, Identifier [Axis]: Bluestem Brands, Inc., Common Stock October 01,2020      
Schedule of Investments [Line Items]      
Units (in shares) [15],[27]   723,184  
Cost [15],[27]   $ 1  
Fair value [15],[27]   $ 1,515  
Investment, Identifier [Axis]: Bluestem Brands, Inc., Secured Debt August 28,2020      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   10.00%  
Interest, variable rate [15],[23]   8.50%  
Principal [15],[23]   $ 5,357  
Cost [15],[23]   5,357  
Fair value [15],[23]   $ 5,337  
Investment, Identifier [Axis]: Bluestem Brands, Inc.., Common Stock October 01, 2020      
Schedule of Investments [Line Items]      
Units (in shares) [14],[26] 723,184    
Cost [14],[26] $ 1    
Fair value [14],[26] $ 5,445    
Investment, Identifier [Axis]: Boccella Precast Products LLC, Member Units June 30, 2017      
Schedule of Investments [Line Items]      
Units (in shares) [26] 2,160,000    
Cost [26] $ 2,256    
Fair value [26] $ 3,320    
Investment, Identifier [Axis]: Boccella Precast Products LLC, Member Units June 30,2017      
Schedule of Investments [Line Items]      
Units (in shares) [27]   2,160,000  
Cost [27]   $ 2,256  
Fair value [27]   $ 4,830  
Investment, Identifier [Axis]: Boccella Precast Products LLC, Secured Debt September 23, 2021      
Schedule of Investments [Line Items]      
Interest rate 10.00%    
Principal $ 320    
Cost 320    
Fair value $ 320    
Investment, Identifier [Axis]: Boccella Precast Products LLC, Secured Debt September 23,2021      
Schedule of Investments [Line Items]      
Interest rate   10.00%  
Principal   $ 320  
Cost   320  
Fair value   $ 320  
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Class A Preferred Member Units December 31,2020      
Schedule of Investments [Line Items]      
Interest rate [27]   14.00%  
Cost [27]   $ 10,194  
Fair value [27]   $ 10,194  
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Class B Preferred Member Units December 31,2020      
Schedule of Investments [Line Items]      
Units (in shares) 140,000 [26] 140,000 [27]  
Interest rate 8.00% [26] 8.00% [27]  
Cost $ 14,000 [26] $ 14,000 [27]  
Fair value $ 27,010 [26] $ 23,170 [27]  
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt December 31,2020      
Schedule of Investments [Line Items]      
Interest rate [23]   10.50%  
Interest, variable rate [23]   9.00%  
Principal [23]   $ 39,000  
Cost [23]   38,687  
Fair value [23]   $ 39,000  
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt One December 31,2020      
Schedule of Investments [Line Items]      
Interest, variable rate [21],[22] 8.00%    
Principal [21],[22] $ 0    
Cost [21],[22] 0    
Fair value [21],[22] $ 0    
Investment, Identifier [Axis]: Bolder Panther Group, LLC, Secured Debt Two December 31,2020      
Schedule of Investments [Line Items]      
Interest rate [21] 12.63%    
Interest, variable rate [21] 10.00%    
Principal [21] $ 99,194    
Cost [21] 98,615    
Fair value [21] $ 99,194    
Investment, Identifier [Axis]: Brainworks Software, LLC, Secured Debt August 12,2014      
Schedule of Investments [Line Items]      
Interest rate [9],[23],[28],[30]   12.50%  
Interest, variable rate [9],[23],[28],[30]   9.25%  
Principal [9],[23],[28],[30]   $ 7,817  
Cost [9],[23],[28],[30]   7,817  
Fair value [9],[23],[28],[30]   $ 4,201  
Investment, Identifier [Axis]: Brainworks Software, LLC, Secured Debt One August 12, 2014      
Schedule of Investments [Line Items]      
Interest rate [8],[21],[29],[33] 12.50%    
Interest, variable rate [8],[21],[29],[33] 9.25%    
Principal [8],[21],[29],[33] $ 761    
Cost [8],[21],[29],[33] 761    
Fair value [8],[21],[29],[33] $ 761    
Investment, Identifier [Axis]: Brainworks Software, LLC, Secured Debt Two August 12, 2014      
Schedule of Investments [Line Items]      
Interest rate [8],[21],[29],[33] 12.50%    
Interest, variable rate [8],[21],[29],[33] 9.25%    
Principal [8],[21],[29],[33] $ 7,056    
Cost [8],[21],[29],[33] 7,056    
Fair value [8],[21],[29],[33] $ 3,440    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units January 09,2018      
Schedule of Investments [Line Items]      
Units (in shares) [27]   2,950  
Cost [27]   $ 4,280  
Fair value [27]   $ 7,710  
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Preferred Member Units January 9, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [26] 2,950    
Cost [26] $ 4,280    
Fair value [26] $ 5,670    
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Secured Debt January 09,2018      
Schedule of Investments [Line Items]      
Interest rate [23]   11.00%  
Interest, variable rate [23]   10.00%  
Principal [23]   $ 8,060  
Cost [23]   8,037  
Fair value [23]   $ 8,037  
Investment, Identifier [Axis]: Brewer Crane Holdings, LLC, Secured Debt January 9, 2018      
Schedule of Investments [Line Items]      
Interest rate [21] 12.56%    
Interest, variable rate 10.00%    
Principal [21] $ 6,088    
Cost [21] 6,084    
Fair value [21] $ 6,084    
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Preferred Member Units July 25, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [26],[35] 17,742    
Cost [26],[35] $ 1,000    
Fair value [26],[35] $ 1,000    
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Preferred Member Units July 25,2016      
Schedule of Investments [Line Items]      
Units (in shares) [27],[34]   17,742  
Cost [27],[34]   $ 1,000  
Fair value [27],[34]   $ 1,000  
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Secured Debt July 25, 2016      
Schedule of Investments [Line Items]      
Interest rate [34]   13.00%  
Principal [34]   $ 1,000  
Cost [34]   1,000  
Fair value [34]   $ 1,000  
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Secured Debt July 25,2016      
Schedule of Investments [Line Items]      
Interest rate   13.00%  
Principal   $ 8,813  
Cost   8,813  
Fair value   $ 8,813  
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Secured Debt One July 25, 2016      
Schedule of Investments [Line Items]      
Interest rate 13.00%    
Principal $ 8,813    
Cost 8,813    
Fair value $ 8,813    
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Secured Debt Two July 25, 2016      
Schedule of Investments [Line Items]      
Interest rate [35] 13.00%    
Principal [35] $ 1,000    
Cost [35] 1,000    
Fair value [35] $ 1,000    
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Warrants July 25, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [24] 82    
Cost [24] $ 2,132    
Fair value [24] $ 4,260    
Investment, Identifier [Axis]: Bridge Capital Solutions Corporation, Warrants July 25,2016      
Schedule of Investments [Line Items]      
Units (in shares) [25]   82  
Cost [25]   $ 2,132  
Fair value [25]   $ 4,060  
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund III, LP) July 21, 2014      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 1.55%    
Cost [10],[11],[26],[36] $ 7,062    
Fair value [10],[11],[26],[36] $ 4,564    
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund III, LP) July 21,2014      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[27],[37]   1.60%  
Cost [12],[13],[27],[37]   $ 7,200  
Fair value [12],[13],[27],[37]   $ 4,269  
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund IV, LP) November 26, 2016      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 0.59%    
Cost [10],[11],[26],[36] $ 4,350    
Fair value [10],[11],[26],[36] $ 4,477    
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund IV, LP) October 26,2016      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[27],[37]   0.60%  
Cost [12],[13],[27],[37]   $ 4,350  
Fair value [12],[13],[27],[37]   $ 4,394  
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund V, LP) July 12, 2021      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[36] 1.31%    
Cost [10],[11],[36] $ 2,000    
Fair value [10],[11],[36] $ 2,139    
Investment, Identifier [Axis]: Brightwood Capital Fund Investments, LP Interests (Brightwood Capital Fund V, LP) July 12,2021      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[37]   15.80%  
Cost [12],[13],[37]   $ 1,000  
Fair value [12],[13],[37]   $ 1,000  
Investment, Identifier [Axis]: Buca C, LLC, Preferred Member Units June 30, 2015      
Schedule of Investments [Line Items]      
Units (in shares) 6    
Interest rate 6.00%    
PIK Rate 6.00%    
Cost $ 4,770    
Fair value $ 0    
Investment, Identifier [Axis]: Buca C, LLC, Preferred Member Units June 30,2015      
Schedule of Investments [Line Items]      
Units (in shares)   6  
Interest rate   6.00%  
PIK Rate   6.00%  
Cost   $ 4,770  
Fair value   $ 0  
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt June 30, 2015      
Schedule of Investments [Line Items]      
Interest rate 9.00%    
Principal $ 17,525    
Cost 17,525    
Fair value $ 14,006    
Investment, Identifier [Axis]: Buca C, LLC, Secured Debt June 30,2015      
Schedule of Investments [Line Items]      
Interest rate [23],[30]   10.25%  
Interest, variable rate [23],[30]   9.25%  
Principal [23],[30]   $ 19,491  
Cost [23],[30]   19,491  
Fair value [23],[30]   $ 14,370  
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt June 14,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   6.00%  
Interest, variable rate [9],[23]   5.00%  
Principal [9],[23]   $ 465  
Cost [9],[23]   429  
Fair value [9],[23]   $ 429  
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt One June 14, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 7.52%    
Interest, variable rate [8],[21] 5.00%    
Principal [8],[21] $ 620    
Cost [8],[21] 590    
Fair value [8],[21] $ 620    
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt One June 14,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   6.00%  
Interest, variable rate [9],[23]   5.00%  
Principal [9],[23]   $ 20,134  
Cost [9],[23]   19,803  
Fair value [9],[23]   $ 19,985  
Investment, Identifier [Axis]: Burning Glass Intermediate Holding Company, Inc., Secured Debt Two June 14, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 7.52%    
Interest, variable rate [8],[21] 5.00%    
Principal [8],[21] $ 19,933    
Cost [8],[21] 19,643    
Fair value [8],[21] $ 19,933    
Investment, Identifier [Axis]: CAI Software LLC, Preferred Equity One December 13,2021      
Schedule of Investments [Line Items]      
Units (in shares)   1,788,527  
Cost   $ 1,789  
Fair value   $ 1,789  
Investment, Identifier [Axis]: CAI Software LLC, Preferred Equity Two December 13,2021      
Schedule of Investments [Line Items]      
Units (in shares)   596,176  
Cost   $ 0  
Fair value   $ 0  
Investment, Identifier [Axis]: CAI Software LLC., Preferred Equity One December 13, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [26] 1,788,527    
Cost [26] $ 1,789    
Fair value [26] $ 1,789    
Investment, Identifier [Axis]: CAI Software LLC., Preferred Equity Two December 13, 2021      
Schedule of Investments [Line Items]      
Units (in shares) 596,176    
Cost $ 0    
Fair value $ 0    
Investment, Identifier [Axis]: CBT Nuggets, LLC, Member Units June 01,2006      
Schedule of Investments [Line Items]      
Units (in shares) [27]   416  
Cost [27]   $ 1,300  
Fair value [27]   $ 50,620  
Investment, Identifier [Axis]: CBT Nuggets, LLC, Member Units June 1, 2006      
Schedule of Investments [Line Items]      
Units (in shares) [26] 416    
Cost [26] $ 1,300    
Fair value [26] $ 48,250    
Investment, Identifier [Axis]: CMS Minerals Investments Member Units April 1, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [26],[35] 100    
Cost [26],[35] $ 1,423    
Fair value [26],[35] $ 1,890    
Investment, Identifier [Axis]: CMS Minerals Investments, Member Units April 01,2016      
Schedule of Investments [Line Items]      
Units (in shares) [27],[34]   100  
Cost [27],[34]   $ 1,838  
Fair value [27],[34]   $ 1,974  
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt November 14, 2017      
Schedule of Investments [Line Items]      
Interest rate [8],[21],[38] 11.31%    
Interest, variable rate [8],[21],[38] 8.50%    
PIK Rate [8],[21],[38] 0.13%    
Principal [8],[21],[38] $ 28,385    
Cost [8],[21],[38] 28,302    
Fair value [8],[21],[38] $ 28,352    
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt November 14, 2017      
Schedule of Investments [Line Items]      
PIK Rate 2.00%    
Investment, Identifier [Axis]: Cadence Aerospace LLC, Secured Debt November 14,2017      
Schedule of Investments [Line Items]      
Interest rate [9],[39]   9.28%  
PIK Rate [9],[39]   0.22%  
Principal [9],[39]   $ 28,540  
Cost [9],[39]   28,399  
Fair value [9],[39]   $ 26,767  
Investment, Identifier [Axis]: Café Brazil, LLC, Member Units June 9, 2006      
Schedule of Investments [Line Items]      
Units (in shares) [26] 1,233    
Cost [26] $ 1,742    
Fair value [26] $ 2,370    
Investment, Identifier [Axis]: Café Brazil, LLC, Member Units June 09,2006      
Schedule of Investments [Line Items]      
Units (in shares) [27]   1,233  
Cost [27]   $ 1,742  
Fair value [27]   $ 2,570  
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units July 31,2019      
Schedule of Investments [Line Items]      
Units (in shares) [27]   6,725  
Interest rate [27]   15.00%  
PIK Rate [27]   15.00%  
Cost [27]   $ 9,510  
Fair value [27]   $ 9,510  
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units March 30,2018      
Schedule of Investments [Line Items]      
Units (in shares) [27]   6,157  
Cost [27]   $ 10,775  
Fair value [27]   $ 13,275  
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units One March 30, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [26] 6,157    
Cost [26] $ 10,775    
Fair value [26] $ 21,025    
Investment, Identifier [Axis]: California Splendor Holdings LLC, Preferred Member Units Two March 30,2018      
Schedule of Investments [Line Items]      
Units (in shares) [26] 3,671    
Interest rate [26] 15.00%    
PIK Rate [26] 15.00%    
Cost [26] $ 3,853    
Fair value [26] $ 3,853    
Investment, Identifier [Axis]: California Splendor Holdings LLC, Secured Debt March 30,2018      
Schedule of Investments [Line Items]      
Interest rate 12.38% [21] 11.00% [23]  
Interest, variable rate 10.00% [21] 10.00% [23]  
Principal $ 28,000 [21] $ 28,000 [23]  
Cost 27,948 [21] 27,915 [23]  
Fair value $ 28,000 [21] $ 27,915 [23]  
Investment, Identifier [Axis]: Camin Cargo Control, Inc., Secured Debt June 14, 2021      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 9.62%    
Interest, variable rate [14],[21] 6.50%    
Principal [14],[21] $ 15,258    
Cost [14],[21] 15,142    
Fair value [14],[21] $ 14,724    
Investment, Identifier [Axis]: Camin Cargo Control, Inc., Secured Debt June 14,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   7.50%  
Interest, variable rate [15],[23]   6.50%  
Principal [15],[23]   $ 15,920  
Cost [15],[23]   15,775  
Fair value [15],[23]   $ 15,840  
Investment, Identifier [Axis]: Career Team Holdings, LLC, Class A Common Units December 17,2021      
Schedule of Investments [Line Items]      
Units (in shares)   450,000  
Cost   $ 4,500  
Fair value   $ 4,500  
Investment, Identifier [Axis]: Career Team Holdings, LLC, Common Stock December 17, 2021      
Schedule of Investments [Line Items]      
Units (in shares) 450,000    
Cost $ 4,500    
Fair value $ 4,500    
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt December 17,2021      
Schedule of Investments [Line Items]      
Interest rate   12.50%  
Principal   $ 20,250  
Cost   20,050  
Fair value   $ 20,050  
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt One December 17, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [21],[22] 6.00%    
Principal [21],[22] $ 0    
Cost [21],[22] 0    
Fair value [21],[22] $ 0    
Investment, Identifier [Axis]: Career Team Holdings, LLC, Secured Debt Two December 17, 2021      
Schedule of Investments [Line Items]      
Interest rate 12.50%    
Principal $ 20,250    
Cost 20,080    
Fair value $ 20,080    
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt One May 18, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 5.25%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (11)    
Fair value [8],[21],[22] $ (11)    
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt Three May 18, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.26%    
Interest, variable rate [8],[21] 5.25%    
Principal [8],[21] $ 6,133    
Cost [8],[21] 6,076    
Fair value [8],[21] $ 5,999    
Investment, Identifier [Axis]: CaseWorthy, Inc., Secured Debt Two May 18, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 5.25%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] 0    
Fair value [8],[21],[22] $ 0    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Preferred Member Units January 04,2019      
Schedule of Investments [Line Items]      
Units (in shares)   12,696  
Cost   $ 5,840  
Fair value   $ 5,840  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Preferred Member Units January 4, 2019      
Schedule of Investments [Line Items]      
Units (in shares) 13,309    
Cost $ 6,122    
Fair value $ 8,160    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt January 04,2019      
Schedule of Investments [Line Items]      
Interest rate [23]   12.00%  
Interest, variable rate [23]   10.00%  
Principal [23]   $ 9,416  
Cost [23]   9,370  
Fair value [23]   $ 8,864  
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt One January 4, 2019      
Schedule of Investments [Line Items]      
Interest, variable rate [21],[22] 9.00%    
Principal [21],[22] $ 0    
Cost [21],[22] 0    
Fair value [21],[22] $ 0    
Investment, Identifier [Axis]: Centre Technologies Holdings, LLC, Secured Debt Two January 4, 2019      
Schedule of Investments [Line Items]      
Interest rate [21] 11.63%    
Interest, variable rate [21] 9.00%    
Principal [21] $ 15,030    
Cost [21] 14,947    
Fair value [21] $ 14,947    
Investment, Identifier [Axis]: Cenveo Corporation, Common Stock September 07,2018      
Schedule of Investments [Line Items]      
Units (in shares) [15]   322,907  
Cost [15]   $ 6,183  
Fair value [15]   $ 2,852  
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units February 26,2018      
Schedule of Investments [Line Items]      
Units (in shares) [27]   4,347  
Cost [27]   $ 11,440  
Fair value [27]   $ 24,140  
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units November 2, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [27],[34]   1,047,146  
Cost [27],[34]   $ 1,322  
Fair value [27],[34]   $ 1,540  
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units One February 26, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [26] 4,347    
Cost [26] $ 11,440    
Fair value [26] $ 22,330    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Member Units Two November 2, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [26],[35] 1,047,146    
Cost [26],[35] $ 1,773    
Fair value [26],[35] $ 1,991    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt February 26,2018      
Schedule of Investments [Line Items]      
Interest rate [23]   9.00%  
Interest, variable rate [23]   8.00%  
Principal [23]   $ 17,817  
Cost [23]   17,738  
Fair value [23]   $ 17,817  
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt One February 26, 2018      
Schedule of Investments [Line Items]      
Interest, variable rate [21],[22] 6.00%    
Principal [21],[22] $ 0    
Cost [21],[22] 0    
Fair value [21],[22] $ 0    
Investment, Identifier [Axis]: Chamberlin Holding LLC, Secured Debt Two February 26, 2018      
Schedule of Investments [Line Items]      
Interest rate [21] 10.63%    
Interest, variable rate [21] 8.00%    
Principal [21] $ 17,466    
Cost [21] 17,438    
Fair value [21] $ 17,466    
Investment, Identifier [Axis]: Chandler Signs Holdings, LLC, Class A Units January 04, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [8] 1,500,000    
Cost [8] $ 1,500    
Fair value [8] $ 970    
Investment, Identifier [Axis]: Chandler Signs Holdings, LLC, Class A Units January 04,2016      
Schedule of Investments [Line Items]      
Units (in shares) [9]   1,500,000  
Cost [9]   $ 1,500  
Fair value [9]   $ 460  
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt One February 07, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.08%    
Interest, variable rate [8],[20],[21] 6.25%    
Principal [8],[20],[21] $ 5,183    
Cost [8],[20],[21] 5,075    
Fair value [8],[20],[21] $ 4,937    
Investment, Identifier [Axis]: Channel Partners Intermediateco, LLC, Secured Debt Two February 07, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21],[40] 7.70%    
Interest, variable rate [8],[20],[21],[40] 6.25%    
Principal [8],[20],[21],[40] $ 39,155    
Cost [8],[20],[21],[40] 38,462    
Fair value [8],[20],[21],[40] $ 37,299    
Investment, Identifier [Axis]: Charps, LLC, Preferred Member Units February 03, 2017      
Schedule of Investments [Line Items]      
Units (in shares) [26] 1,829    
Cost [26] $ 1,963    
Fair value [26] $ 13,210    
Investment, Identifier [Axis]: Charps, LLC, Preferred Member Units February 03,2017      
Schedule of Investments [Line Items]      
Units (in shares) [27]   1,829  
Cost [27]   $ 1,963  
Fair value [27]   $ 13,990  
Investment, Identifier [Axis]: Charps, LLC, Preferred Unsecured Debt August 26, 2020      
Schedule of Investments [Line Items]      
Interest rate 10.00%    
Principal $ 5,694    
Cost 4,635    
Fair value $ 5,694    
Investment, Identifier [Axis]: Charps, LLC, Unsecured Debt February 26,2018      
Schedule of Investments [Line Items]      
Interest rate   10.00%  
Principal   $ 5,694  
Cost   4,599  
Fair value   $ 5,694  
Investment, Identifier [Axis]: Chisholm Energy Holdings, LLC, Secured Debt May 15,2019      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.75%  
Interest, variable rate [9],[23]   6.25%  
Principal [9],[23]   $ 2,857  
Cost [9],[23]   2,804  
Fair value [9],[23]   $ 2,663  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units One December 20, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [26] 717    
Cost [26] $ 7,280    
Fair value [26] $ 9,490    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units One December 20,2016      
Schedule of Investments [Line Items]      
Units (in shares) [27]   717  
Cost [27]   $ 7,280  
Fair value [27]   $ 10,250  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Member Units Two December 20,2016      
Schedule of Investments [Line Items]      
Units (in shares) 800 [35] 800 [34]  
Cost $ 210 [35] $ 210 [34]  
Fair value $ 610 [35] $ 530 [34]  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt One December 20, 2016      
Schedule of Investments [Line Items]      
Interest rate [21] 12.13%    
Interest, variable rate [21] 9.50%    
Principal [21] $ 10,480    
Cost [21] 10,430    
Fair value [21] $ 10,430    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt One December 20,2016      
Schedule of Investments [Line Items]      
Interest rate [23]   10.50%  
Interest, variable rate [23]   9.50%  
Principal [23]   $ 10,480  
Cost [23]   10,401  
Fair value [23]   $ 10,401  
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt Two December 20, 2016      
Schedule of Investments [Line Items]      
Interest rate 10.00%    
Principal $ 1,057    
Cost 1,047    
Fair value $ 1,047    
Investment, Identifier [Axis]: Clad-Rex Steel, LLC, Secured Debt Two December 20,2016      
Schedule of Investments [Line Items]      
Interest rate   10.00%  
Principal   $ 1,081  
Cost   1,071  
Fair value   $ 1,071  
Investment, Identifier [Axis]: Clarius BIGS, LLC , Secured Debt September 23,2014      
Schedule of Investments [Line Items]      
Interest rate [8],[29],[33] 15.00%    
PIK Rate [8],[29],[33] 15.00%    
Principal [8],[29],[33] $ 2,729    
Cost [8],[29],[33] 2,729    
Fair value [8],[29],[33] $ 10    
Investment, Identifier [Axis]: Clarius BIGS, LLC, Secured Debt September 23,2014      
Schedule of Investments [Line Items]      
Interest rate [9],[28],[30]   15.00%  
PIK Rate [9],[28],[30]   15.00%  
Principal [9],[28],[30]   $ 2,756  
Cost [9],[28],[30]   2,756  
Fair value [9],[28],[30]   $ 33  
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Preferred Member Units March 12, 2020      
Schedule of Investments [Line Items]      
Units (in shares) [26] 154    
Cost [26] $ 5,760    
Fair value [26] $ 23,790    
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Preferred Member Units March 12,2020      
Schedule of Investments [Line Items]      
Units (in shares) [27]   154  
Cost [27]   $ 5,760  
Fair value [27]   $ 15,260  
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Secured Debt One March 12, 2020      
Schedule of Investments [Line Items]      
Interest rate [21] 8.38%    
Interest, variable rate [21] 6.00%    
Principal [21] $ 7,760    
Cost [21] 7,760    
Fair value [21] $ 7,760    
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Secured Debt One March 12,2020      
Schedule of Investments [Line Items]      
Interest rate [23]   7.00%  
Interest, variable rate [23]   6.00%  
Principal [23]   $ 4,000  
Cost [23]   4,000  
Fair value [23]   $ 4,000  
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Secured Debt Two March 12, 2020      
Schedule of Investments [Line Items]      
Interest rate 8.00%    
Principal $ 19,274    
Cost 19,171    
Fair value $ 19,274    
Investment, Identifier [Axis]: Classic H&G Holdings, LLC, Secured Debt Two March 12,2020      
Schedule of Investments [Line Items]      
Interest rate   8.00%  
Principal   $ 19,274  
Cost   19,139  
Fair value   $ 19,274  
Investment, Identifier [Axis]: Cody Pools, Inc., Preferred Member Units March 06, 2020      
Schedule of Investments [Line Items]      
Units (in shares) [26],[35] 587    
Cost [26],[35] $ 8,317    
Fair value [26],[35] $ 57,210    
Investment, Identifier [Axis]: Cody Pools, Inc., Preferred Member Units March 06,2020      
Schedule of Investments [Line Items]      
Units (in shares) [27],[34]   587  
Cost [27],[34]   $ 8,317  
Fair value [27],[34]   $ 47,640  
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt March 06,2020      
Schedule of Investments [Line Items]      
Interest rate [23]   12.25%  
Interest, variable rate [23]   10.50%  
Principal [23]   $ 42,497  
Cost [23]   42,117  
Fair value [23]   $ 42,484  
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt One March 06, 2020      
Schedule of Investments [Line Items]      
Interest, variable rate [21],[22] 10.50%    
Principal [21],[22] $ 0    
Cost [21],[22] (11)    
Fair value [21],[22] $ (11)    
Investment, Identifier [Axis]: Cody Pools, Inc., Secured Debt Two March 06, 2020      
Schedule of Investments [Line Items]      
Interest rate [21] 13.63%    
Interest, variable rate [21] 10.50%    
Principal [21] $ 41,225    
Cost [21] 40,924    
Fair value [21] $ 41,225    
Investment, Identifier [Axis]: Colonial Electric Company LLC, Preferred Member Units March 31, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [26] 17,280    
Cost [26] $ 7,680    
Fair value [26] 9,210    
Investment, Identifier [Axis]: Colonial Electric Company LLC, Preferred Member Units March 31,2021      
Schedule of Investments [Line Items]      
Units (in shares) [27]   17,280  
Cost [27]   $ 7,680  
Fair value [27]   $ 9,130  
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt March 31,2021      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 24,570  
Cost   24,351  
Fair value   $ 24,351  
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt One March 31, 2021      
Schedule of Investments [Line Items]      
Principal [22] 0    
Cost [22] 0    
Fair value [22] $ 0    
Investment, Identifier [Axis]: Colonial Electric Company LLC, Secured Debt Two March 31, 2021      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 23,625    
Cost 23,451    
Fair value $ 23,451    
Investment, Identifier [Axis]: CompareNetworks Topco, LLC, Preferred Member Units January 29, 2019      
Schedule of Investments [Line Items]      
Units (in shares) [26] 1,975    
Cost [26] $ 1,975    
Fair value [26] $ 18,570    
Investment, Identifier [Axis]: CompareNetworks Topco, LLC, Preferred Member Units January 29,2019      
Schedule of Investments [Line Items]      
Units (in shares) [27]   1,975  
Cost [27]   $ 1,975  
Fair value [27]   $ 12,000  
Investment, Identifier [Axis]: CompareNetworks Topco, LLC, Secured Debt January 29,2019      
Schedule of Investments [Line Items]      
Interest rate [23]   10.00%  
Interest, variable rate [23]   9.00%  
Principal [23]   $ 6,477  
Cost [23]   6,452  
Fair value [23]   $ 6,477  
Investment, Identifier [Axis]: CompareNetworks Topco, LLC, Secured Debt Two January 29, 2019      
Schedule of Investments [Line Items]      
Interest rate [21] 11.63%    
Interest, variable rate [21] 9.00%    
Principal [21] $ 5,350    
Cost [21] 5,339    
Fair value [21] $ 5,350    
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt August 06,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.50%  
Interest, variable rate [9],[23]   7.50%  
Principal [9],[23]   $ 21,681  
Cost [9],[23]   21,234  
Fair value [9],[23]   $ 21,234  
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt One August 06, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.13%    
Interest, variable rate [8],[21] 7.50%    
Principal [8],[21] $ 5,000    
Cost [8],[21] 4,923    
Fair value [8],[21] $ 4,519    
Investment, Identifier [Axis]: Computer Data Source, LLC, Secured Debt Two August 06, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.37%    
Interest, variable rate [8],[21] 7.50%    
Principal [8],[21] $ 18,656    
Cost [8],[21] 18,364    
Fair value [8],[21] $ 16,860    
Investment, Identifier [Axis]: Congruent Credit Opportunities Funds, LP Interests (Congruent Credit Opportunities Fund III, LP) February 04, 2015      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 17.40%    
Cost [10],[11],[26],[36] $ 8,214    
Fair value [10],[11],[26],[36] $ 7,854    
Investment, Identifier [Axis]: Congruent Credit Opportunities Funds, LP Interests (Congruent Credit Opportunities Fund III, LP) February 04,2015      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[27],[37]   17.40%  
Cost [12],[13],[27],[37]   $ 10,256  
Fair value [12],[13],[27],[37]   $ 9,959  
Investment, Identifier [Axis]: Construction Supply Investments, LLC, Member Units December 29,2016      
Schedule of Investments [Line Items]      
Units (in shares) [9],[27]   861,618  
Cost [9],[27]   $ 3,335  
Fair value [9],[27]   $ 14,640  
Investment, Identifier [Axis]: Construction Supply Investments, LLC., Member Units December 29, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [8],[26] 861,618    
Cost [8],[26] $ 3,335    
Fair value [8],[26] $ 20,795    
Investment, Identifier [Axis]: Copper Trail Fund Investments, LP Interests (CTMH, LP) July 17, 2017      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[36] 38.75%    
Cost [10],[11],[36] $ 710    
Fair value [10],[11],[36] $ 710    
Investment, Identifier [Axis]: Copper Trail Fund Investments, LP Interests (CTMH, LP) July 17,2017      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[37]   38.80%  
Cost [12],[13],[37]   $ 710  
Fair value [12],[13],[37]   $ 710  
Investment, Identifier [Axis]: DMA Industries, LLC, Preferred Equity November 19, 2021      
Schedule of Investments [Line Items]      
Units (in shares) 5,944    
Cost $ 5,944    
Fair value $ 7,260    
Investment, Identifier [Axis]: DMA Industries, LLC, Preferred Equity November 30,2015      
Schedule of Investments [Line Items]      
Units (in shares)   5,944  
Cost   $ 5,944  
Fair value   $ 5,944  
Investment, Identifier [Axis]: DMA Industries, LLC, Secured Debt November 19, 2021      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 21,200    
Cost 21,025    
Fair value $ 21,200    
Investment, Identifier [Axis]: DMA Industries, LLC, Secured Debt November 30,2015      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 21,200  
Cost   20,993  
Fair value   $ 20,993  
Investment, Identifier [Axis]: DTE Enterprises LLC Class A Class AA Preferred Member Units (non-voting) April 13, 2018      
Schedule of Investments [Line Items]      
Interest rate [8],[26] 10.00%    
PIK Rate [8],[26] 10.00%    
Cost [8],[26] $ 1,132    
Fair value [8],[26] $ 1,132    
Investment, Identifier [Axis]: DTE Enterprises LLC Class A Preferred Member Units April 13, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [8] 776,316    
Interest rate [8] 8.00%    
PIK Rate [8] 8.00%    
Cost [8] $ 776    
Fair value [8] $ 270    
Investment, Identifier [Axis]: DTE Enterprises LLC Secured Debt One April 13, 2018      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 7.50%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (2)    
Fair value [8],[21],[22] $ (2)    
Investment, Identifier [Axis]: DTE Enterprises LLC Secured Debt Two April 13, 2018      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.44%    
Interest, variable rate [8],[21] 7.50%    
Principal [8],[21] $ 7,824    
Cost [8],[21] 7,803    
Fair value [8],[21] $ 7,486    
Investment, Identifier [Axis]: DTE Enterprises, LLC, Class A Preferred Member Units April 13,2018      
Schedule of Investments [Line Items]      
Units (in shares) [9]   776,316  
Interest rate [9]   8.00%  
PIK Rate [9]   8.00%  
Cost [9]   $ 776  
Fair value [9]   $ 320  
Investment, Identifier [Axis]: DTE Enterprises, LLC, Class AA Preferred Member Units (non-voting) April 13,2018      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   10.00%  
PIK Rate [9],[23]   10.00%  
Cost [9],[23]   $ 1,051  
Fair value [9],[23]   $ 1,051  
Investment, Identifier [Axis]: DTE Enterprises, LLC, Secured Debt April 13,2018      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   9.50%  
Interest, variable rate [9],[23]   8.00%  
Principal [9],[23]   $ 9,324  
Cost [9],[23]   9,259  
Fair value [9],[23]   $ 8,884  
Investment, Identifier [Axis]: Darr Equipment LP, Secured Debt December 26,2017      
Schedule of Investments [Line Items]      
Interest rate [9]   12.50%  
PIK Rate [9]   1.00%  
Principal [9]   $ 4,685  
Cost [9]   4,685  
Fair value [9]   $ 4,227  
Investment, Identifier [Axis]: Darr Equipment LP, Warrants April 15,2014      
Schedule of Investments [Line Items]      
Units (in shares) [9],[41]   915,734  
Cost [9],[41]   $ 474  
Fair value [9],[41]   $ 160  
Investment, Identifier [Axis]: Datacom, LLC, Preferred Member Units March 31, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [26] 9,000    
Cost [26] $ 2,610    
Fair value [26] $ 2,670    
Investment, Identifier [Axis]: Datacom, LLC, Preferred Member Units March 31,2021      
Schedule of Investments [Line Items]      
Units (in shares)   9,000  
Cost   $ 2,610  
Fair value   $ 2,610  
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt March 31,2021      
Schedule of Investments [Line Items]      
Interest rate   5.00%  
Principal   $ 8,892  
Cost   8,296  
Fair value   $ 7,668  
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt One March 1, 2022      
Schedule of Investments [Line Items]      
Interest rate 7.50%    
Principal $ 223    
Cost 223    
Fair value $ 223    
Investment, Identifier [Axis]: Datacom, LLC, Secured Debt Two March 31, 2021      
Schedule of Investments [Line Items]      
Interest rate 7.50%    
Principal $ 8,690    
Cost 8,217    
Fair value $ 7,749    
Investment, Identifier [Axis]: Digital Products Holdings LLC, Preferred Member April 01, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [26] 3,857    
Cost [26] $ 9,501    
Fair value [26] $ 9,835    
Investment, Identifier [Axis]: Digital Products Holdings LLC, Preferred Member Units April 01,2018      
Schedule of Investments [Line Items]      
Units (in shares) [27]   3,857  
Cost [27]   $ 9,501  
Fair value [27]   $ 9,835  
Investment, Identifier [Axis]: Digital Products Holdings LLC, Secured Debt April 01, 2018      
Schedule of Investments [Line Items]      
Interest rate [21] 12.63%    
Interest, variable rate [21] 10.00%    
Principal [21] $ 15,863    
Cost [21] 15,844    
Fair value [21] $ 15,844    
Investment, Identifier [Axis]: Digital Products Holdings LLC, Secured Debt January 29,2019      
Schedule of Investments [Line Items]      
Interest rate [23]   11.00%  
Interest, variable rate [23]   10.00%  
Principal [23]   $ 16,853  
Cost [23]   16,801  
Fair value [23]   $ 16,801  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Preferred Stock February 13, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [26] 8,400    
Cost [26] $ 8,400    
Fair value [26] $ 22,220    
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Preferred Stock February 13,2018      
Schedule of Investments [Line Items]      
Units (in shares) [27]   8,400  
Cost [27]   $ 8,400  
Fair value [27]   $ 18,350  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Secured Debt February 13,2018      
Schedule of Investments [Line Items]      
Interest rate [23]   12.00%  
Interest, variable rate [23]   11.00%  
Principal [23]   $ 24,070  
Cost [23]   23,911  
Fair value [23]   $ 24,048  
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Secured Debt One February 13, 2018      
Schedule of Investments [Line Items]      
Interest rate [21] 13.63%    
Interest, variable rate [21] 11.00%    
Principal [21] $ 3,400    
Cost [21] 3,386    
Fair value [21] $ 3,400    
Investment, Identifier [Axis]: Direct Marketing Solutions, Inc., Secured Debt Two February 13, 2018      
Schedule of Investments [Line Items]      
Interest rate [21] 13.63%    
Interest, variable rate [21] 11.00%    
Principal [21] $ 23,050    
Cost [21] 22,966    
Fair value [21] $ 23,050    
Investment, Identifier [Axis]: Dos Rios Partners, LP Interests (Dos Rios Partners - A, LP) April 25, 2013      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[36] 6.43%    
Cost [10],[11],[36] $ 2,097    
Fair value [10],[11],[36] $ 2,916    
Investment, Identifier [Axis]: Dos Rios Partners, LP Interests (Dos Rios Partners - A, LP) April 25,2013      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[37]   6.40%  
Cost [12],[13],[37]   $ 2,097  
Fair value [12],[13],[37]   $ 3,280  
Investment, Identifier [Axis]: Dos Rios Partners, LP Interests (Dos Rios Partners, LP) April 25, 2013      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[36] 20.24%    
Cost [10],[11],[36] $ 6,605    
Fair value [10],[11],[36] $ 9,182    
Investment, Identifier [Axis]: Dos Rios Partners, LP Interests (Dos Rios Partners, LP) April 25,2013      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[37]   20.20%  
Cost [12],[13],[37]   $ 6,605  
Fair value [12],[13],[37]   $ 10,329  
Investment, Identifier [Axis]: Dos Rios Stone Products LLC, Class A Preferred Units June 27, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [8],[35] 2,000,000    
Cost [8],[35] $ 2,000    
Fair value [8],[35] $ 350    
Investment, Identifier [Axis]: Dos Rios Stone Products LLC, Class A Preferred Units June 27,2016      
Schedule of Investments [Line Items]      
Units (in shares) [9],[34]   2,000,000  
Cost [9],[34]   $ 2,000  
Fair value [9],[34]   $ 640  
Investment, Identifier [Axis]: Dynamic Communities, LLC, Secured Debt July 17,2018      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   9.50%  
Interest, variable rate [9],[23]   8.50%  
Principal [9],[23]   $ 5,681  
Cost [9],[23]   5,638  
Fair value [9],[23]   $ 5,569  
Investment, Identifier [Axis]: Dynamic Communities, LLC, Secured Debt One July 17, 2018      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 8.50%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] 0    
Fair value [8],[21],[22] $ 0    
Investment, Identifier [Axis]: Dynamic Communities, LLC, Secured Debt Three September 28, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 12.75%    
Interest, variable rate [8],[21] 9.50%    
Principal [8],[21] $ 2,805    
Cost [8],[21] 2,791    
Fair value [8],[21] $ 2,147    
Investment, Identifier [Axis]: Dynamic Communities, LLC, Secured Debt Two September 28, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.75%    
Interest, variable rate [8],[21] 7.50%    
Principal [8],[21] $ 2,805    
Cost [8],[21] 2,791    
Fair value [8],[21] $ 2,268    
Investment, Identifier [Axis]: EIG Fund Investments, LP Interests (EIG Global Private Debt Fund-A, L.P.) November 06, 2015      
Schedule of Investments [Line Items]      
Units (in shares) [10],[11],[26],[36] 5,000,000    
Cost [10],[11],[26],[36] $ 1,518    
Fair value [10],[11],[26],[36] $ 1,470    
Investment, Identifier [Axis]: EIG Fund Investments, LP Interests (EIG Global Private Debt Fund-A, L.P.) November 06,2015      
Schedule of Investments [Line Items]      
Units (in shares) [12],[13],[27],[37]   5,000,000  
Cost [12],[13],[27],[37]   $ 594  
Fair value [12],[13],[27],[37]   $ 547  
Investment, Identifier [Axis]: EPIC Y-Grade Services, LP, Secured Debt June 22, 2018      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 8.08%    
Interest, variable rate [14],[21] 6.00%    
Principal [14],[21] $ 6,840    
Cost [14],[21] 6,778    
Fair value [14],[21] $ 5,803    
Investment, Identifier [Axis]: EPIC Y-Grade Services, LP, Secured Debt June 22,2018      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   7.00%  
Interest, variable rate [15],[23]   6.00%  
Principal [15],[23]   $ 6,892  
Cost [15],[23]   6,819  
Fair value [15],[23]   $ 5,862  
Investment, Identifier [Axis]: Eastern Wholesale Fence LLC, Secured Debt November 19,2020      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.00%  
Interest, variable rate [9],[23]   7.00%  
Principal [9],[23]   $ 31,810  
Cost [9],[23]   31,238  
Fair value [9],[23]   $ 31,810  
Investment, Identifier [Axis]: Eastern Wholesale Fence LLC, Secured Debt One November 19, 2020      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.07%    
Interest, variable rate [8],[21] 7.00%    
Principal [8],[21] $ 4,461    
Cost [8],[21] 4,400    
Fair value [8],[21] $ 4,342    
Investment, Identifier [Axis]: Eastern Wholesale Fence LLC, Secured Debt Three November 19, 2020      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.07%    
Interest, variable rate [8],[21] 7.00%    
Principal [8],[21] $ 23,606    
Cost [8],[21] 23,272    
Fair value [8],[21] $ 22,974    
Investment, Identifier [Axis]: Eastern Wholesale Fence LLC, Secured Debt Two November 19, 2020      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.07%    
Interest, variable rate [8],[21] 7.00%    
Principal [8],[21] $ 5,053    
Cost [8],[21] 4,995    
Fair value [8],[21] $ 4,918    
Investment, Identifier [Axis]: Emerald Technologies Acquisition Co, Inc., Secured Debt February 10, 2022      
Schedule of Investments [Line Items]      
Interest rate [14],[20],[21] 9.38%    
Interest, variable rate [14],[20],[21] 6.25%    
Principal [14],[20],[21] $ 9,258    
Cost [14],[20],[21] 9,091    
Fair value [14],[20],[21] $ 8,911    
Investment, Identifier [Axis]: EnCap Energy Fund Investments, LP Interests (EnCap Energy Capital Fund IX, L.P.) January 22,2015      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[27],[37]   0.10%  
Cost [12],[13],[27],[37]   $ 4,047  
Fair value [12],[13],[27],[37]   $ 2,284  
Investment, Identifier [Axis]: EnCap Energy Fund Investments, LP Interests (EnCap Energy Capital Fund VIII Co- Investors, L.P.) January 21,2015      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[37]   0.40%  
Cost [12],[13],[37]   $ 2,097  
Fair value [12],[13],[37]   $ 777  
Investment, Identifier [Axis]: EnCap Energy Fund Investments, LP Interests (EnCap Energy Capital Fund VIII, L.P.) January 22,2015      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[27],[37]   0.10%  
Cost [12],[13],[27],[37]   $ 3,745  
Fair value [12],[13],[27],[37]   $ 1,599  
Investment, Identifier [Axis]: EnCap Energy Fund Investments, LP Interests (EnCap Energy Capital Fund X, L.P.) March 25,2015      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[27],[37]   0.10%  
Cost [12],[13],[27],[37]   $ 8,443  
Fair value [12],[13],[27],[37]   $ 8,276  
Investment, Identifier [Axis]: EnCap Energy Fund Investments, LP Interests (EnCap Flatrock Midstream Fund II, L.P.) March 30,2015      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[37]   0.80%  
Cost [12],[13],[37]   $ 6,582  
Fair value [12],[13],[37]   $ 2,796  
Investment, Identifier [Axis]: EnCap Energy Fund Investments, LP Interests (EnCap Flatrock Midstream Fund III, L.P.) March 27,2015      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[27],[37]   0.20%  
Cost [12],[13],[27],[37]   $ 6,082  
Fair value [12],[13],[27],[37]   $ 5,064  
Investment, Identifier [Axis]: EnCap Energy Fund Investments., LP Interests (EnCap Flatrock Midstream Fund III, L.P.) March 27, 2015      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 0.25%    
Cost [10],[11],[26],[36] $ 6,019    
Fair value [10],[11],[26],[36] $ 5,089    
Investment, Identifier [Axis]: EnCap Energy Fund Investments., LP Interests (EnCap Energy Capital Fund VIII, L.P.) January 22, 2015      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 0.14%    
Cost [10],[11],[26],[36] $ 3,587    
Fair value [10],[11],[26],[36] $ 2,184    
Investment, Identifier [Axis]: EnCap Energy Fund Investments., LP Interests (EnCap Flatrock Midstream Fund II, L.P.) March 30, 2015      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[36] 0.84%    
Cost [10],[11],[36] $ 5,358    
Fair value [10],[11],[36] $ 1,583    
Investment, Identifier [Axis]: EnCap Energy Fund Investments., LP Interests LP Interests (EnCap Energy Capital Fund IX, L.P.) January 22, 2015      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 0.10%    
Cost [10],[11],[26],[36] $ 3,755    
Fair value [10],[11],[26],[36] $ 2,177    
Investment, Identifier [Axis]: EnCap Energy Fund Investments., LP Interests LP Interests (EnCap Energy Capital Fund VIII Co- Investors, L.P.) January 21, 2015      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 0.38%    
Cost [10],[11],[26],[36] $ 1,984    
Fair value [10],[11],[26],[36] $ 1,037    
Investment, Identifier [Axis]: EnCap Energy Fund Investments., LP Interests LP Interests (LP Interests (EnCap Energy Capital Fund X, L.P.) March 25, 2015      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 0.15%    
Cost [10],[11],[26],[36] $ 8,326    
Fair value [10],[11],[26],[36] $ 10,130    
Investment, Identifier [Axis]: Engineering Research & Consulting, LLC, Secured Debt One May 23, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 11.00%    
Interest, variable rate [8],[20],[21] 6.25%    
Principal [8],[20],[21] $ 120    
Cost [8],[20],[21] 72    
Fair value [8],[20],[21] $ 116    
Investment, Identifier [Axis]: Engineering Research & Consulting, LLC, Secured Debt Two May 23, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.38%    
Interest, variable rate [8],[20],[21] 6.25%    
Principal [8],[20],[21] $ 16,338    
Cost [8],[20],[21] 16,034    
Fair value [8],[20],[21] $ 15,772    
Investment, Identifier [Axis]: Event Holdco, LLC, Secured Debt December 22,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23],[34]   8.00%  
Interest, variable rate [9],[23],[34]   7.00%  
Principal [9],[23],[34]   $ 51,692  
Cost [9],[23],[34]   51,135  
Fair value [9],[23],[34]   $ 51,135  
Investment, Identifier [Axis]: Event Holdco, LLC, Secured Debt One December 22, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21],[35] 9.25%    
Interest, variable rate [8],[21],[35] 7.00%    
Principal [8],[21],[35] $ 3,692    
Cost [8],[21],[35] 3,661    
Fair value [8],[21],[35] $ 3,367    
Investment, Identifier [Axis]: Event Holdco, LLC, Secured Debt Two December 22, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21],[35] 10.67%    
Interest, variable rate [8],[21],[35] 7.00%    
Principal [8],[21],[35] $ 44,308    
Cost [8],[21],[35] 43,933    
Fair value [8],[21],[35] $ 40,402    
Investment, Identifier [Axis]: Flame King Holdings, LLC, Preferred Equity October 29,2021      
Schedule of Investments [Line Items]      
Units (in shares)   9,360  
Cost   $ 10,400  
Fair value   $ 10,400  
Investment, Identifier [Axis]: Flame King Holdings, LLC, Preferred Equity October 29, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [26] 9,360    
Cost [26] $ 10,400    
Fair value [26] $ 13,840    
Investment, Identifier [Axis]: Flame King Holdings, LLC, Secured Debt One October 29, 2021      
Schedule of Investments [Line Items]      
Interest rate [21] 9.25%    
Interest, variable rate [21] 6.50%    
Principal [21] $ 7,600    
Cost [21] 7,536    
Fair value [21] $ 7,600    
Investment, Identifier [Axis]: Flame King Holdings, LLC, Secured Debt One October 29,2021      
Schedule of Investments [Line Items]      
Interest rate [23]   7.50%  
Interest, variable rate [23]   6.50%  
Principal [23]   $ 6,400  
Cost [23]   6,324  
Fair value [23]   $ 6,324  
Investment, Identifier [Axis]: Flame King Holdings, LLC, Secured Debt Two October 29, 2021      
Schedule of Investments [Line Items]      
Interest rate [21] 13.75%    
Interest, variable rate [21] 11.00%    
Principal [21] $ 21,200    
Cost [21] 21,027    
Fair value [21] $ 21,200    
Investment, Identifier [Axis]: Flame King Holdings, LLC, Secured Debt Two October 29,2021      
Schedule of Investments [Line Items]      
Interest rate [23]   12.00%  
Interest, variable rate [23]   11.00%  
Principal [23]   $ 21,200  
Cost [23]   20,996  
Fair value [23]   $ 20,996  
Investment, Identifier [Axis]: Flip Electronics LLC, Secured Debt January 04,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23],[42]   9.09%  
Interest, variable rate [9],[23],[42]   8.09%  
Principal [9],[23],[42]   $ 5,400  
Cost [9],[23],[42]   5,304  
Fair value [9],[23],[42]   $ 5,287  
Investment, Identifier [Axis]: Flip Electronics LLC, Secured Debt One March 24, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 11.21%    
Interest, variable rate [8],[20],[21] 7.50%    
Principal [8],[20],[21] $ 491    
Cost [8],[20],[21] 491    
Fair value [8],[20],[21] $ 491    
Investment, Identifier [Axis]: Flip Electronics LLC, Secured Debt Two January 04, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 11.19%    
Interest, variable rate [8],[20],[21] 7.50%    
Principal [8],[20],[21] $ 6,185    
Cost [8],[20],[21] 6,078    
Fair value [8],[20],[21] $ 6,078    
Investment, Identifier [Axis]: Fortna Acquisition Co., Inc., Secured Debt July 23,2019      
Schedule of Investments [Line Items]      
Interest rate [9]   5.09%  
Interest, variable rate [9]   5.00%  
Principal [9]   $ 7,595  
Cost [9]   7,525  
Fair value [9]   $ 7,595  
Investment, Identifier [Axis]: Freeport Financial Funds, LP Interests (Freeport Financial SBIC Fund LP) March 23, 2015      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 9.30%    
Cost [10],[11],[26],[36] $ 4,064    
Fair value [10],[11],[26],[36] $ 4,116    
Investment, Identifier [Axis]: Freeport Financial Funds, LP Interests (Freeport Financial SBIC Fund LP) March 23,2015      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[37]   9.30%  
Cost [12],[13],[37]   $ 5,974  
Fair value [12],[13],[37]   $ 6,078  
Investment, Identifier [Axis]: Freeport Financial Funds, LP Interests (Freeport First Lien Loan Fund III LP) July 31, 2015      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 5.95%    
Cost [10],[11],[26],[36] $ 6,630    
Fair value [10],[11],[26],[36] $ 6,175    
Investment, Identifier [Axis]: Freeport Financial Funds, LP Interests (Freeport First Lien Loan Fund III LP) July 31,2015      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[27],[37]   6.00%  
Cost [12],[13],[27],[37]   $ 7,629  
Fair value [12],[13],[27],[37]   $ 7,231  
Investment, Identifier [Axis]: Fuse, LLC, Common Stock June 30, 2019      
Schedule of Investments [Line Items]      
Units (in shares) [14] 10,429    
Cost [14] $ 256    
Fair value [14] $ 0    
Investment, Identifier [Axis]: Fuse, LLC, Common Stock June 30,2019      
Schedule of Investments [Line Items]      
Units (in shares) [15]   10,429  
Cost [15]   $ 256  
Fair value [15]   $ 0  
Investment, Identifier [Axis]: Fuse, LLC, Secured Debt June 30, 2019      
Schedule of Investments [Line Items]      
Interest rate [14] 12.00%    
Principal [14] $ 1,810    
Cost [14] 1,810    
Fair value [14] $ 1,512    
Investment, Identifier [Axis]: Fuse, LLC, Secured Debt June 30,2019      
Schedule of Investments [Line Items]      
Interest rate [15]   12.00%  
Principal [15]   $ 1,810  
Cost [15]   1,810  
Fair value [15]   $ 1,672  
Investment, Identifier [Axis]: GFG Group, LLC., Preferred Member Units March 31, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [26] 226    
Cost [26] $ 4,900    
Fair value [26] $ 7,140    
Investment, Identifier [Axis]: GFG Group, LLC., Preferred Member Units March 31,2021      
Schedule of Investments [Line Items]      
Units (in shares) [27]   226  
Cost [27]   $ 4,900  
Fair value [27]   $ 6,990  
Investment, Identifier [Axis]: GFG Group, LLC., Secured Debt March 31, 2021      
Schedule of Investments [Line Items]      
Interest rate 9.00%    
Principal $ 11,745    
Cost 11,661    
Fair value $ 11,745    
Investment, Identifier [Axis]: GFG Group, LLC., Secured Debt March 31,2021      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 12,545  
Cost   12,435  
Fair value   $ 12,545  
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Member Units December 19, 2014      
Schedule of Investments [Line Items]      
Units (in shares) [26] 5,879    
Cost [26] $ 13,065    
Fair value [26] $ 46,190    
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Member Units December 19,2014      
Schedule of Investments [Line Items]      
Units (in shares) [27]   5,879  
Cost [27]   $ 13,065  
Fair value [27]   $ 46,190  
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt December 19, 2014      
Schedule of Investments [Line Items]      
Interest rate 10.56%    
Interest, variable rate 8.00%    
Principal $ 40,493    
Cost 40,301    
Fair value $ 40,493    
Investment, Identifier [Axis]: GRT Rubber Technologies LLC, Secured Debt December 19,2014      
Schedule of Investments [Line Items]      
Interest rate   8.10%  
Interest, variable rate   8.00%  
Principal   $ 38,885  
Cost   38,672  
Fair value   $ 38,885  
Investment, Identifier [Axis]: GS HVAM Intermediate, LLC, Secured Debt October 18,2019      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   6.75%  
Interest, variable rate [9],[23]   5.75%  
Principal [9],[23]   $ 13,243  
Cost [9],[23]   13,167  
Fair value [9],[23]   $ 13,243  
Investment, Identifier [Axis]: GS HVAM Intermediate, LLC, Secured Debt One October 18, 2019      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.26%    
Interest, variable rate [8],[21] 6.50%    
Principal [8],[21] $ 2,273    
Cost [8],[21] 2,264    
Fair value [8],[21] $ 2,211    
Investment, Identifier [Axis]: GS HVAM Intermediate, LLC, Secured Debt Two October 18, 2019      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.62%    
Interest, variable rate [8],[21] 6.50%    
Principal [8],[21] $ 10,858    
Cost [8],[21] 10,813    
Fair value [8],[21] $ 10,564    
Investment, Identifier [Axis]: GS Operating, LLC, Secured Debt February 24,2020      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.00%  
Interest, variable rate [9],[23]   6.50%  
Principal [9],[23]   $ 28,451  
Cost [9],[23]   28,068  
Fair value [9],[23]   $ 28,451  
Investment, Identifier [Axis]: GULF PACIFIC ACQUISITION, LLC, Secured Debt One September 30, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 6.00%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (20)    
Fair value [8],[20],[21],[22] $ (20)    
Investment, Identifier [Axis]: GULF PACIFIC ACQUISITION, LLC, Secured Debt Three September 30, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.59%    
Interest, variable rate [8],[20],[21] 6.00%    
Principal [8],[20],[21] $ 3,661    
Cost [8],[20],[21] 3,588    
Fair value [8],[20],[21] $ 3,588    
Investment, Identifier [Axis]: GULF PACIFIC ACQUISITION, LLC, Secured Debt Two September 30, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 6.00%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (15)    
Fair value [8],[20],[21],[22] $ (15)    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Member Units June 24, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [26] 9,042    
Cost [26] $ 17,692    
Fair value [26] $ 46,470    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Member Units June 24,2016      
Schedule of Investments [Line Items]      
Units (in shares) [27]   9,042  
Cost [27]   $ 17,692  
Fair value [27]   $ 49,700  
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Secured Debt June 24,2016      
Schedule of Investments [Line Items]      
Interest rate [23]   9.50%  
Interest, variable rate [23]   7.50%  
Principal [23]   $ 21,598  
Cost [23]   21,535  
Fair value [23]   $ 21,598  
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Secured Debt One June 24, 2016      
Schedule of Investments [Line Items]      
Interest, variable rate [21],[22] 8.00%    
Principal [21],[22] $ 0    
Cost [21],[22] 0    
Fair value [21],[22] $ 0    
Investment, Identifier [Axis]: Gamber-Johnson Holdings, LLC, Secured Debt Two June 24, 2016      
Schedule of Investments [Line Items]      
Interest rate [21] 10.63%    
Interest, variable rate [21] 8.00%    
Principal [21] $ 24,078    
Cost [21] 24,019    
Fair value [21] $ 24,078    
Investment, Identifier [Axis]: Garreco, LLC, Member Units July 15, 2013      
Schedule of Investments [Line Items]      
Units (in shares) [26] 1,200    
Cost [26] $ 1,200    
Fair value [26] $ 1,990    
Investment, Identifier [Axis]: Garreco, LLC, Member Units July 15,2013      
Schedule of Investments [Line Items]      
Units (in shares) [27]   1,200  
Cost [27]   $ 1,200  
Fair value [27]   $ 2,270  
Investment, Identifier [Axis]: Garreco, LLC, Secured Debt July 15, 2013      
Schedule of Investments [Line Items]      
Interest rate [21],[43] 9.50%    
Interest, variable rate [21],[43] 8.00%    
Principal [21],[43] $ 3,826    
Cost [21],[43] 3,826    
Fair value [21],[43] $ 3,826    
Investment, Identifier [Axis]: Garreco, LLC, Secured Debt July 15,2013      
Schedule of Investments [Line Items]      
Interest rate [23],[44]   9.00%  
Interest, variable rate [23],[44]   8.00%  
Principal [23],[44]   $ 4,196  
Cost [23],[44]   4,196  
Fair value [23],[44]   $ 4,196  
Investment, Identifier [Axis]: GeoStabilization International (GSI), Secured Debt January 02, 2019      
Schedule of Investments [Line Items]      
Interest rate [14] 8.07%    
Interest, variable rate [14] 5.25%    
Principal [14] $ 20,550    
Cost [14] 20,474    
Fair value [14] $ 20,139    
Investment, Identifier [Axis]: GeoStabilization International (GSI), Secured Debt January 02,2019      
Schedule of Investments [Line Items]      
Interest rate [15]   5.35%  
Interest, variable rate [15]   5.25%  
Principal [15]   $ 20,710  
Cost [15]   20,615  
Fair value [15]   $ 20,606  
Investment, Identifier [Axis]: GoWireless Holdings, Inc., Secured Debt January 10,2018      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   7.50%  
Interest, variable rate [15],[23]   6.50%  
Principal [15],[23]   $ 18,534  
Cost [15],[23]   18,440  
Fair value [15],[23]   $ 18,576  
Investment, Identifier [Axis]: Grupo Hima San Pablo, Inc., Secured Debt March 07,2013      
Schedule of Investments [Line Items]      
Interest rate [15],[23],[28],[30]   9.25%  
Interest, variable rate [15],[23],[28],[30]   7.00%  
Principal [15],[23],[28],[30]   $ 4,504  
Cost [15],[23],[28],[30]   4,504  
Fair value [15],[23],[28],[30]   $ 1,269  
Investment, Identifier [Axis]: Grupo Hima San Pablo, Inc., Secured Debt One March 07,2013      
Schedule of Investments [Line Items]      
Interest rate [15],[28],[30]   13.75%  
Principal [15],[28],[30]   $ 2,055  
Cost [15],[28],[30]   2,040  
Fair value [15],[28],[30]   $ 49  
Investment, Identifier [Axis]: Grupo Hima San Pablo, Inc., Secured Debt Two March 07,2013      
Schedule of Investments [Line Items]      
Interest rate [15],[30]   12.00%  
Principal [15],[30]   $ 147  
Cost [15],[30]   147  
Fair value [15],[30]   $ 147  
Investment, Identifier [Axis]: Gulf Manufacturing, LLC, Member Units August 31,2007      
Schedule of Investments [Line Items]      
Units (in shares) [27]   438  
Cost [27]   $ 2,980  
Fair value [27]   $ 5,640  
Investment, Identifier [Axis]: Gulf Manufacturing, LLC,Member Units August 13, 2007      
Schedule of Investments [Line Items]      
Units (in shares) [26] 438    
Cost [26] $ 2,980    
Fair value [26] $ 5,810    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Member Units April 29, 2016      
Schedule of Investments [Line Items]      
Units (in shares) 3,681    
Cost $ 3,681    
Fair value $ 0    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Member Units April 29,2016      
Schedule of Investments [Line Items]      
Units (in shares)   3,681  
Cost   $ 3,681  
Fair value   $ 0  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Member Units July 1, 2022      
Schedule of Investments [Line Items]      
Units (in shares) 63,720    
Cost $ 5,600    
Fair value $ 3,920    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Secured Debt April 29, 2016      
Schedule of Investments [Line Items]      
Interest rate [30]   12.50%  
PIK Rate [30]   6.25%  
Principal [30]   $ 13,565  
Cost [30]   13,565  
Fair value [30]   $ 9,717  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Secured Debt One September 29, 2017      
Schedule of Investments [Line Items]      
Interest, variable rate [21],[22] 9.50%    
Principal [21],[22] $ 0    
Cost [21],[22] 0    
Fair value [21],[22] $ 0    
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Secured Debt September 29,2017      
Schedule of Investments [Line Items]      
Interest rate [23],[30]   10.50%  
Interest, variable rate [23],[30]   9.50%  
PIK Rate [23],[30]   5.25%  
Principal [23],[30]   $ 257  
Cost [23],[30]   257  
Fair value [23],[30]   $ 257  
Investment, Identifier [Axis]: Gulf Publishing Holdings, LLC, Secured Debt Two July 01, 2022      
Schedule of Investments [Line Items]      
Interest rate 12.50%    
Principal $ 2,400    
Cost 2,400    
Fair value $ 2,284    
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings, Secured Debt December 21,2018      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.50%  
Interest, variable rate [9],[23]   7.50%  
Principal [9],[23]   $ 3,449  
Cost [9],[23]   3,419  
Fair value [9],[23]   $ 3,059  
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings, Secured Debt One December 21, 2018      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 11.76%    
Interest, variable rate [8],[20],[21] 9.50%    
PIK Rate [8],[20],[21] 5.75%    
Principal [8],[20],[21] $ 320    
Cost [8],[20],[21] 319    
Fair value [8],[20],[21] $ 297    
Investment, Identifier [Axis]: HDC/HW Intermediate Holdings, Secured Debt Two December 21, 2018      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 11.76%    
Interest, variable rate [8],[20],[21] 9.50%    
PIK Rate [8],[20],[21] 5.75%    
Principal [8],[20],[21] $ 3,117    
Cost [8],[20],[21] 3,100    
Fair value [8],[20],[21] $ 2,888    
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt One August 01, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 6.50%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (65)    
Fair value [8],[20],[21],[22] $ (65)    
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt Three August 01, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.52%    
Interest, variable rate [8],[20],[21] 6.50%    
Principal [8],[20],[21] $ 16,875    
Cost [8],[20],[21] 16,549    
Fair value [8],[20],[21] $ 16,549    
Investment, Identifier [Axis]: HEADLANDS OP-CO LLC, Secured Debt Two August 01, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 6.50%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (65)    
Fair value [8],[20],[21],[22] $ (65)    
Investment, Identifier [Axis]: HOWLCO LLC, Secured Debt August 11, 2021      
Schedule of Investments [Line Items]      
Interest rate [11],[14],[16],[21] 8.96%    
Interest, variable rate [11],[14],[16],[21] 6.00%    
Principal [11],[14],[16],[21] $ 25,354    
Cost [11],[14],[16],[21] 25,354    
Fair value [11],[14],[16],[21] $ 23,648    
Investment, Identifier [Axis]: HOWLCO LLC, Secured Debt August 19,2021      
Schedule of Investments [Line Items]      
Interest rate [13],[15],[23],[45]   7.00%  
Interest, variable rate [13],[15],[23],[45]   6.00%  
Principal [13],[15],[23],[45]   $ 25,546  
Cost [13],[15],[23],[45]   25,546  
Fair value [13],[15],[23],[45]   $ 25,546  
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (2717 MH, L.P.) March 11, 2022      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[36] 49.26%    
Cost [10],[11],[36] $ 244    
Fair value [10],[11],[36] $ 244    
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (2717 MH, L.P.) October 01, 2017      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[36] 49.26%    
Cost [10],[11],[36] $ 3,895    
Fair value [10],[11],[36] $ 7,142    
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (2717 MH, L.P.) October 1,2007      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[37]   49.30%  
Cost [12],[13],[37]   $ 2,703  
Fair value [12],[13],[37]   $ 3,971  
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (423 COR, LP) June 02, 2022      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[36] 22.93%    
Cost [10],[11],[36] $ 1,400    
Fair value [10],[11],[36] $ 1,400    
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (HPEP 3, L.P.) August 09, 2017      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 8.22%    
Cost [10],[11],[26],[36] $ 2,558    
Fair value [10],[11],[26],[36] $ 4,331    
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (HPEP 3, L.P.) August 09,2017      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[37]   8.20%  
Cost [12],[13],[37]   $ 3,193  
Fair value [12],[13],[37]   $ 4,712  
Investment, Identifier [Axis]: Harris Preston Fund Investments, LP Interests (HPEP 4, L.P.) July 12, 2022      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[36] 9.60%    
Cost [10],[11],[36] $ 1,896    
Fair value [10],[11],[36] $ 1,896    
Investment, Identifier [Axis]: Harrison Hydra-Gen, Ltd., Common Stock June 04, 2010      
Schedule of Investments [Line Items]      
Units (in shares) 107,456    
Cost $ 718    
Fair value $ 3,280    
Investment, Identifier [Axis]: Harrison Hydra-Gen, Ltd., Common Stock June 04,2010      
Schedule of Investments [Line Items]      
Units (in shares)   107,456  
Cost   $ 718  
Fair value   $ 3,530  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Secured Debt One December 02,2016      
Schedule of Investments [Line Items]      
Interest rate [13],[23]   7.00%  
Interest, variable rate [13],[23]   6.00%  
Principal [13],[23]   $ 2,585  
Cost [13],[23]   2,585  
Fair value [13],[23]   $ 2,585  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Secured Debt Two December 02,2016      
Schedule of Investments [Line Items]      
Interest rate [13]   8.00%  
Principal [13]   $ 34,800  
Cost [13]   34,672  
Fair value [13]   $ 34,800  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Preferred Member Units One December 02, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [26] 226    
Cost [26] $ 2,850    
Fair value [26] $ 19,080    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Preferred Member Units One December 02,2016      
Schedule of Investments [Line Items]      
Units (in shares) [13],[27]   226  
Cost [13],[27]   $ 2,850  
Fair value [13],[27]   $ 14,680  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Preferred Member Units Two December 02, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [35] 226    
Cost [35] $ 150    
Fair value [35] $ 1,000    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Preferred Member Units Two December 02,2016      
Schedule of Investments [Line Items]      
Units (in shares) [13],[34]   226  
Cost [13],[34]   $ 150  
Fair value [13],[34]   $ 770  
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Secured Debt One December 02, 2016      
Schedule of Investments [Line Items]      
Interest rate [21] 8.38%    
Interest, variable rate [21] 6.00%    
Principal [21] $ 3,185    
Cost [21] 3,182    
Fair value [21] $ 3,182    
Investment, Identifier [Axis]: Hawk Ridge Systems, LLC, Secured Debt Two December 02, 2016      
Schedule of Investments [Line Items]      
Interest rate 8.00%    
Principal $ 37,800    
Cost 37,675    
Fair value $ 37,800    
Investment, Identifier [Axis]: Heartland Dental, LLC, Secured Debt September 09, 2020,      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.62%    
Interest, variable rate [8],[21] 6.50%    
Principal [8],[21] $ 14,663    
Cost [8],[21] 14,405    
Fair value [8],[21] $ 13,563    
Investment, Identifier [Axis]: Heartland Dental, LLC, Secured Debt September 09,2020      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.50%  
Interest, variable rate [9],[23]   6.50%  
Principal [9],[23]   $ 14,813  
Cost [9],[23]   14,477  
Fair value [9],[23]   $ 14,887  
Investment, Identifier [Axis]: Houston Plating and Coatings, LLC, Member Units January 08, 2003      
Schedule of Investments [Line Items]      
Units (in shares) [26] 322,297    
Cost [26] $ 2,352    
Fair value [26] $ 2,220    
Investment, Identifier [Axis]: Houston Plating and Coatings, LLC, Member Units January 08,2003      
Schedule of Investments [Line Items]      
Units (in shares) [27]   322,297  
Cost [27]   $ 2,352  
Fair value [27]   $ 3,210  
Investment, Identifier [Axis]: Houston Plating and Coatings, LLC, Unsecured Convertible Debt May 01, 2017      
Schedule of Investments [Line Items]      
Interest rate 8.00%    
Principal $ 3,000    
Cost 3,000    
Fair value $ 2,750    
Investment, Identifier [Axis]: Houston Plating and Coatings, LLC, Unsecured Convertible Debt May 01,2017      
Schedule of Investments [Line Items]      
Interest rate   8.00%  
Principal   $ 3,000  
Cost   3,000  
Fair value   $ 2,960  
Investment, Identifier [Axis]: Hybrid Promotions, LLC, Secured Debt June 30, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.33%    
Interest, variable rate [8],[21] 8.25%    
Principal [8],[21] $ 7,088    
Cost [8],[21] 6,979    
Fair value [8],[21] $ 6,721    
Investment, Identifier [Axis]: Hybrid Promotions, LLC, Secured Debt June 30,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   9.25%  
Interest, variable rate [9],[23]   8.25%  
Principal [9],[23]   $ 7,088  
Cost [9],[23]   6,957  
Fair value [9],[23]   7,028  
Investment, Identifier [Axis]: I-45 SLF LLC, Investment Partnership October 20, 2015      
Schedule of Investments [Line Items]      
Units (in shares) [10],[11],[26] 0    
Cost [10],[11],[26] $ 19,000    
Fair value [10],[11],[26] $ 12,507    
Investment, Identifier [Axis]: I-45 SLF LLC, Member Units (Fully diluted 20.0%; 24.40% profits interest) (8) October 20,2015      
Schedule of Investments [Line Items]      
Cost [12],[13],[27]   19,000  
Fair value [12],[13],[27]   $ 14,387  
Investment, Identifier [Axis]: IG Parent Corporation, Secured Debt July 30,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.75%  
Interest, variable rate [15],[23]   5.75%  
Principal [15],[23]   $ 9,591  
Cost [15],[23]   9,419  
Fair value [15],[23]   $ 9,419  
Investment, Identifier [Axis]: IG Parent Corporation, Secured Debt One July 30, 2021      
Schedule of Investments [Line Items]      
Interest rate [14],[20],[21] 8.41%    
Interest, variable rate [14],[20],[21] 5.75%    
Principal [14],[20],[21] $ 443    
Cost [14],[20],[21] 413    
Fair value [14],[20],[21] $ 435    
Investment, Identifier [Axis]: IG Parent Corporation, Secured Debt Two July 30, 2021      
Schedule of Investments [Line Items]      
Interest rate [14],[20],[21] 8.23%    
Interest, variable rate [14],[20],[21] 5.75%    
Principal [14],[20],[21] $ 14,536    
Cost [14],[20],[21] 14,327    
Fair value [14],[20],[21] $ 14,279    
Investment, Identifier [Axis]: INW Manufacturing, LLC, Secured Debt May 19, 2021      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 8.71%    
Interest, variable rate [14],[21] 5.75%    
Principal [14],[21] $ 7,125    
Cost [14],[21] 6,959    
Fair value [14],[21] $ 6,306    
Investment, Identifier [Axis]: INW Manufacturing, LLC, Secured Debt May 19,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.50%  
Interest, variable rate [15],[23]   5.75%  
Principal [15],[23]   $ 7,406  
Cost [15],[23]   7,205  
Fair value [15],[23]   $ 7,258  
Investment, Identifier [Axis]: Implus Footcare, LLC, Secured Debt June 01, 2017      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.25%    
Interest, variable rate [8],[21] 7.75%    
PIK Rate [8],[21] 0.25%    
Principal [8],[21] $ 18,609    
Cost [8],[21] 18,452    
Fair value [8],[21] 17,194    
Investment, Identifier [Axis]: Implus Footcare, LLC, Secured Debt June 01,2017      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.75%  
Interest, variable rate [9],[23]   7.75%  
Principal [9],[23]   $ 18,702  
Cost [9],[23]   18,471  
Fair value [9],[23]   $ 17,743  
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holding, Member Units November 20, 2018      
Schedule of Investments [Line Items]      
Cost [8] 1,558    
Fair value [8] $ 0    
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Member Units November 20, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [8] 1,558,333    
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Member Units November 20,2018      
Schedule of Investments [Line Items]      
Units (in shares) [9]   1,558,333  
Cost [9]   $ 1,558  
Fair value [9]   $ 0  
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Preferred Stock (non-voting) One December 10, 2020      
Schedule of Investments [Line Items]      
Interest rate [8],[29] 6.00%    
PIK Rate [8],[29] 6.00%    
Cost [8],[29] $ 3,235    
Fair value [8],[29] 0    
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Preferred Stock (non-voting) One December 10,2020      
Schedule of Investments [Line Items]      
Interest rate [9]   6.00%  
PIK Rate [9]   6.00%  
Cost [9]   $ 3,235  
Fair value [9]   4,329  
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Preferred Stock (non-voting) Two December 10, 2020      
Schedule of Investments [Line Items]      
Cost [8] 0    
Fair value [8] $ 0    
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Preferred Stock (non-voting) Two December 10,2020      
Schedule of Investments [Line Items]      
Cost [9]   0  
Fair value [9]   $ 0  
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Secured Debt August 20,2020      
Schedule of Investments [Line Items]      
Interest rate [9],[46]   7.20%  
Principal [9],[46]   $ 6,563  
Cost [9],[46]   6,563  
Fair value [9],[46]   $ 6,563  
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Secured Debt December 10,2020      
Schedule of Investments [Line Items]      
Interest rate [9]   6.00%  
PIK Rate [9]   6.00%  
Principal [9]   $ 17,891  
Cost [9]   16,861  
Fair value [9]   $ 16,861  
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Secured Debt One August 20, 2020      
Schedule of Investments [Line Items]      
Interest rate [8],[47] 11.26%    
PIK Rate [8],[47] 11.26%    
Principal [8],[47] $ 6,831    
Cost [8],[47] 6,831    
Fair value [8],[47] $ 6,831    
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Secured Debt Two December 10, 2020      
Schedule of Investments [Line Items]      
Interest rate [8],[29] 6.00%    
PIK Rate [8],[29] 6.00%    
Principal [8],[29] $ 18,428    
Cost [8],[29] 17,664    
Fair value [8],[29] $ 13,419    
Investment, Identifier [Axis]: Independent Pet Partners Intermediate Holdings, LLC, Warrants One November 20, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [8],[22],[48] 242,914    
Cost [8],[22],[48] $ 0    
Fair value [8],[22],[48] $ 0    
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Member Units June 17, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [8],[35] 900    
Cost [8],[35] $ 900    
Fair value [8],[35] $ 690    
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Member Units June 17,2016      
Schedule of Investments [Line Items]      
Units (in shares) [9],[34]   900  
Cost [9],[34]   $ 900  
Fair value [9],[34]   $ 730  
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Preferred Member Units January 31,2018      
Schedule of Investments [Line Items]      
Units (in shares) [9],[27],[34]   144  
Interest rate [9],[27],[34]   10.00%  
PIK Rate [9],[27],[34]   10.00%  
Cost [9],[27],[34]   $ 120  
Fair value [9],[27],[34]   $ 164  
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Preferred Member Units May 17,2019      
Schedule of Investments [Line Items]      
Units (in shares) [9],[27],[34]   80  
Interest rate [9],[27],[34]   20.00%  
PIK Rate [9],[27],[34]   20.00%  
Cost [9],[27],[34]   $ 81  
Fair value [9],[27],[34]   $ 99  
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Preferred Member Units One January 31, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [8],[26],[35] 144    
Interest rate [8],[26],[35] 10.00%    
PIK Rate [8],[26],[35] 10.00%    
Cost [8],[26],[35] $ 127    
Fair value [8],[26],[35] $ 161    
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Preferred Member Units Two May 17, 2019      
Schedule of Investments [Line Items]      
Units (in shares) [8],[26],[35] 80    
Interest rate [8],[26],[35] 20.00%    
PIK Rate [8],[26],[35] 20.00%    
Cost [8],[26],[35] $ 89    
Fair value [8],[26],[35] $ 101    
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Secured Debt August 13,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.75%  
Interest, variable rate [9],[23]   6.75%  
Principal [9],[23]   $ 19,897  
Cost [9],[23]   19,490  
Fair value [9],[23]   $ 19,490  
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Secured Debt One August 13, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.88%    
Interest, variable rate [8],[21] 6.75%    
Principal [8],[21] $ 463    
Cost [8],[21] 428    
Fair value [8],[21] $ 463    
Investment, Identifier [Axis]: Industrial Services Acquisition, LLC, Secured Debt Two August 13, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.69%    
Interest, variable rate [8],[21] 6.75%    
Principal [8],[21] $ 19,288    
Cost [8],[21] 18,984    
Fair value [8],[21] $ 19,288    
Investment, Identifier [Axis]: Infolinks Media Buyco, LLC, Secured Debt November 01,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.00%  
Interest, variable rate [9],[23]   6.00%  
Principal [9],[23]   $ 8,680  
Cost [9],[23]   8,487  
Fair value [9],[23]   $ 8,487  
Investment, Identifier [Axis]: Infolinks Media Buyco, LLC, Secured Debt One November 01, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 5.75%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (20)    
Fair value [8],[21],[22] $ (20)    
Investment, Identifier [Axis]: Infolinks Media Buyco, LLC, Secured Debt Two November 01, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.42%    
Interest, variable rate [8],[21] 5.75%    
Principal [8],[21] $ 8,637    
Cost [8],[21] 8,495    
Fair value [8],[21] $ 8,543    
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Common Stock December 07,2021      
Schedule of Investments [Line Items]      
Units (in shares) [8] 2,143    
Cost [8] $ 0    
Fair value [8] $ 0    
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Secured Debt One December 09,2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 12.32%    
Interest, variable rate [8],[21] 10.00%    
Principal [8],[21] $ 1,398    
Cost [8],[21] 1,398    
Fair value [8],[21] $ 1,398    
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Secured Debt Two August 07,2019      
Schedule of Investments [Line Items]      
Interest rate [8],[21],[29] 10.52%    
Interest, variable rate [8],[21],[29] 7.00%    
PIK Rate [8],[21],[29] 1.00%    
Principal [8],[21],[29] $ 7,313    
Cost [8],[21],[29] 7,237    
Fair value [8],[21],[29] $ 1,549    
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Secured Debt August 07,2019      
Schedule of Investments [Line Items]      
Interest rate [9],[23],[28]   9.75%  
Interest, variable rate [9],[23],[28]   7.00%  
PIK Rate [9],[23],[28]   1.00%  
Principal [9],[23],[28]   $ 7,313  
Cost [9],[23],[28]   7,237  
Fair value [9],[23],[28]   $ 5,233  
Investment, Identifier [Axis]: Interface Security Systems, L.L.C, Secured Debt December 09,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   11.75%  
Interest, variable rate [9],[23]   10.00%  
Principal [9],[23]   $ 525  
Cost [9],[23]   525  
Fair value [9],[23]   $ 525  
Investment, Identifier [Axis]: Intermedia Holdings, Inc., Secured Debt August 03, 2018      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 9.12%    
Interest, variable rate [14],[21] 6.00%    
Principal [14],[21] $ 20,467    
Cost [14],[21] 20,414    
Fair value [14],[21] $ 17,960    
Investment, Identifier [Axis]: Intermedia Holdings, Inc., Secured Debt August 03,2018      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   7.00%  
Interest, variable rate [15],[23]   6.00%  
Principal [15],[23]   $ 20,627  
Cost [15],[23]   20,559  
Fair value [15],[23]   $ 20,527  
Investment, Identifier [Axis]: Invincible Boat Company, LLC., Secured Debt August 28,2019      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.00%  
Interest, variable rate [9],[23]   6.50%  
Principal [9],[23]   $ 17,510  
Cost [9],[23]   17,354  
Fair value [9],[23]   $ 17,510  
Investment, Identifier [Axis]: Invincible Boat Company, LLC., Secured Debt One August 28, 2019      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.42%    
Interest, variable rate [8],[21] 6.50%    
Principal [8],[21] $ 726    
Cost [8],[21] 721    
Fair value [8],[21] $ 716    
Investment, Identifier [Axis]: Invincible Boat Company, LLC., Secured Debt Two August 28, 2019      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.75%    
Interest, variable rate [8],[21] 6.50%    
Principal [8],[21] $ 16,889    
Cost [8],[21] 16,774    
Fair value [8],[21] $ 16,645    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Common Stock August 03, 2021      
Schedule of Investments [Line Items]      
Units (in shares) 179,778    
Cost $ 1,798    
Fair value $ 1,798    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Common Stock August 03,2021      
Schedule of Investments [Line Items]      
Units (in shares)   179,778  
Cost   $ 1,798  
Fair value   $ 1,798  
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt September 01,2021      
Schedule of Investments [Line Items]      
Interest rate   12.50%  
Principal   $ 3,200  
Cost   3,170  
Fair value   $ 3,170  
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt Four November 15, 2021      
Schedule of Investments [Line Items]      
Interest rate 12.50%    
Principal $ 20,000    
Cost 19,835    
Fair value $ 19,835    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt One August 02, 2021      
Schedule of Investments [Line Items]      
Interest rate 12.50%    
Principal $ 4,600    
Cost 4,564    
Fair value $ 4,564    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt One August 03,2021      
Schedule of Investments [Line Items]      
Interest rate   13.00%  
Principal   $ 4,600  
Cost   4,557  
Fair value   $ 4,557  
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt Three August 03,2021      
Schedule of Investments [Line Items]      
Interest rate   12.50%  
PIK Rate   12.50%  
Principal   $ 8,944  
Cost   8,944  
Fair value   $ 8,944  
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt Three November 15, 2021      
Schedule of Investments [Line Items]      
Interest rate 12.50%    
Principal $ 8,944    
Cost 8,944    
Fair value $ 8,944    
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt Two August 03,2021      
Schedule of Investments [Line Items]      
Interest rate   12.50%  
Principal   $ 20,000  
Cost   19,805  
Fair value   $ 19,805  
Investment, Identifier [Axis]: Iron-Main Investments, LLC, Secured Debt Two September 01, 2021      
Schedule of Investments [Line Items]      
Interest rate 12.50%    
Principal $ 3,200    
Cost 3,174    
Fair value $ 3,174    
Investment, Identifier [Axis]: Isagenix International, LLC, Secured Debt June 21, 2018      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 9.93%    
Interest, variable rate [14],[21] 7.75%    
PIK Rate [14],[21] 9.93%    
Principal [14],[21] $ 4,951    
Cost [14],[21] 4,933    
Fair value [14],[21] $ 2,140    
Investment, Identifier [Axis]: Isagenix International, LLC, Secured Debt June 21,2018      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.75%  
Interest, variable rate [15],[23]   5.75%  
Principal [15],[23]   $ 5,158  
Cost [15],[23]   5,135  
Fair value [15],[23]   $ 3,865  
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Common Equity December 22, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [8] 1,684,211    
Cost [8] $ 1,684    
Fair value [8] $ 2,340    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Common Equity December 22,2021      
Schedule of Investments [Line Items]      
Units (in shares) [9]   1,684,211  
Cost [9]   $ 1,684  
Fair value [9]   $ 1,684  
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Secured Debt December 22,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.00%  
Interest, variable rate [9],[23]   6.00%  
Principal [9],[23]   $ 37,895  
Cost [9],[23]   36,972  
Fair value [9],[23]   $ 36,972  
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Secured Debt One December 22, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 6.00%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (143)    
Fair value [8],[21],[22] $ (143)    
Investment, Identifier [Axis]: JTI Electrical & Mechanical, LLC, Secured Debt Two December 22, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.26%    
Interest, variable rate [8],[21] 6.00%    
Principal [8],[21] $ 37,421    
Cost [8],[21] 36,788    
Fair value [8],[21] $ 37,321    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Preferred Equity November 08, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [8],[26] 2,826,667    
Cost [8],[26] $ 116    
Fair value [8],[26] $ 616    
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Preferred Equity November 08,2021      
Schedule of Investments [Line Items]      
Units (in shares) [9]   2,826,667  
Cost [9]   $ 314  
Fair value [9]   $ 314  
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Secured Debt May 26,2015      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.00%  
Interest, variable rate [9],[23]   7.00%  
Principal [9],[23]   $ 2,100  
Cost [9],[23]   2,100  
Fair value [9],[23]   $ 2,100  
Investment, Identifier [Axis]: Jackmont Hospitality, Inc., Secured Debt November 08, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.75%    
Interest, variable rate [8],[21] 6.50%    
Principal [8],[21] $ 2,084    
Cost [8],[21] 2,084    
Fair value [8],[21] $ 1,987    
Investment, Identifier [Axis]: Jensen Jewelers of Idaho, LLC, Member Units November 14, 2006      
Schedule of Investments [Line Items]      
Units (in shares) [26] 627    
Cost [26] $ 811    
Fair value [26] $ 14,970    
Investment, Identifier [Axis]: Jensen Jewelers of Idaho, LLC, Member Units November 14,2006      
Schedule of Investments [Line Items]      
Units (in shares) [27]   627  
Cost [27]   $ 811  
Fair value [27]   $ 12,420  
Investment, Identifier [Axis]: Jensen Jewelers of Idaho, LLC, Secured Debt November 14, 2006      
Schedule of Investments [Line Items]      
Interest rate [21] 12.25%    
Interest, variable rate [21] 6.75%    
Principal [21] $ 2,450    
Cost [21] 2,442    
Fair value [21] $ 2,450    
Investment, Identifier [Axis]: Jensen Jewelers of Idaho, LLC, Secured Debt November 14,2006      
Schedule of Investments [Line Items]      
Interest rate [23]   10.00%  
Interest, variable rate [23]   6.75%  
Principal [23]   $ 2,550  
Cost [23]   2,536  
Fair value [23]   $ 2,550  
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Common Stock August 21, 2019      
Schedule of Investments [Line Items]      
Units (in shares) [14] 472,579    
Cost [14] $ 4,429    
Fair value [14] $ 0    
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Common Stock August 21,2019      
Schedule of Investments [Line Items]      
Units (in shares) [15]   472,579  
Cost [15]   $ 4,429  
Fair value [15]   $ 0  
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt August 21,2019      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   7.00%  
Interest, variable rate [15],[23]   6.00%  
Principal [15],[23]   $ 4,034  
Cost [15],[23]   3,989  
Fair value [15],[23]   $ 3,658  
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt November 15,2021      
Schedule of Investments [Line Items]      
Interest rate [15]   15.00%  
PIK Rate [15]   15.00%  
Principal [15]   $ 1,000  
Cost [15]   1,004  
Fair value [15]   $ 1,004  
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt One November 15, 2021      
Schedule of Investments [Line Items]      
Interest rate [14] 15.00%    
Interest, variable rate [14] 15.00%    
PIK Rate [14] 15.00%    
Principal [14] $ 1,833    
Cost [14] 1,833    
Fair value [14] $ 1,833    
Investment, Identifier [Axis]: Joerns Healthcare, LLC, Secured Debt Two August 21, 2019      
Schedule of Investments [Line Items]      
Interest rate [14],[29] 19.75%    
PIK Rate [14],[29] 19.75%    
Principal [14],[29] $ 4,034    
Cost [14],[29] 3,997    
Fair value [14],[29] $ 1,222    
Investment, Identifier [Axis]: Johnson Downie Opco, LLC, Preferred Equity December 10, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [26] 3,150    
Cost [26] $ 3,150    
Fair value [26] $ 5,880    
Investment, Identifier [Axis]: Johnson Downie Opco, LLC, Preferred Equity December 10,2021      
Schedule of Investments [Line Items]      
Units (in shares)   3,150  
Cost   $ 3,150  
Fair value   $ 3,150  
Investment, Identifier [Axis]: Johnson Downie Opco, LLC, Secured Debt December 10,2021      
Schedule of Investments [Line Items]      
Interest rate [23]   13.00%  
Interest, variable rate [23]   11.50%  
Principal [23]   $ 11,475  
Cost [23]   11,344  
Fair value [23]   $ 11,344  
Investment, Identifier [Axis]: Johnson Downie Opco, LLC, Secured Debt One December 10, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [21],[22] 11.50%    
Principal [23] $ 0    
Cost [21],[22] (15)    
Fair value [21],[22] $ (15)    
Investment, Identifier [Axis]: Johnson Downie Opco, LLC, Secured Debt Two December 10, 2021      
Schedule of Investments [Line Items]      
Interest rate [21] 14.13%    
Interest, variable rate [21] 11.50%    
Principal [21] $ 9,999    
Cost [21] 9,915    
Fair value [21] $ 9,999    
Investment, Identifier [Axis]: JorVet Holdings, LLC, Common Stock March 28, 2022      
Schedule of Investments [Line Items]      
Units (in shares) [26] 107,406    
Cost [26] $ 10,741    
Fair value [26] $ 10,741    
Investment, Identifier [Axis]: JorVet Holdings, LLC, Secured Debt March 28, 2022      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 25,650    
Cost 25,419    
Fair value $ 25,419    
Investment, Identifier [Axis]: KBK Industries, LLC, Member Units January 23, 2006      
Schedule of Investments [Line Items]      
Units (in shares) 325 [26] 325 [27]  
Cost $ 783 [26] $ 783 [27]  
Fair value $ 14,390 [26] $ 13,620 [27]  
Investment, Identifier [Axis]: KMS, LLC, Secured Debt October 04,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.25%  
Interest, variable rate [9],[23]   7.25%  
Principal [9],[23]   $ 7,581  
Cost [9],[23]   7,415  
Fair value [9],[23]   $ 7,415  
Investment, Identifier [Axis]: KMS, LLC, Secured Debt One October 04, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.56%    
Interest, variable rate [8],[21] 7.25%    
Principal [8],[21] $ 1,075    
Cost [8],[21] 1,026    
Fair value [8],[21] $ 1,014    
Investment, Identifier [Axis]: KMS, LLC, Secured Debt Two October 04, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.56%    
Interest, variable rate [8],[21] 7.25%    
Principal [8],[21] $ 7,524    
Cost [8],[21] 7,402    
Fair value [8],[21] $ 7,101    
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Member Units One October 31, 2018      
Schedule of Investments [Line Items]      
Units (in shares) 581    
Cost $ 12,240    
Fair value $ 9,250    
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Member Units One October 31,2018      
Schedule of Investments [Line Items]      
Units (in shares)   581  
Cost   $ 12,240  
Fair value   $ 12,310  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Member Units Two October 31, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [26],[35] 800    
Cost [26],[35] $ 992    
Fair value [26],[35] $ 2,460    
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Member Units Two October 31,2018      
Schedule of Investments [Line Items]      
Units (in shares) [27],[34]   800  
Cost [27],[34]   $ 992  
Fair value [27],[34]   $ 2,460  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Secured Debt One October 31, 2018      
Schedule of Investments [Line Items]      
Interest rate 11.50%    
Principal $ 20,415    
Cost 20,361    
Fair value $ 20,361    
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Secured Debt One October 31,2018      
Schedule of Investments [Line Items]      
Interest rate   11.50%  
Principal   $ 20,415  
Cost   20,324  
Fair value   $ 20,324  
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Secured Debt Two October 31, 2018      
Schedule of Investments [Line Items]      
Interest rate 9.00%    
Principal $ 3,888    
Cost 3,851    
Fair value $ 3,851    
Investment, Identifier [Axis]: Kickhaefer Manufacturing Company, LLC, Secured Debt Two October 31,2018      
Schedule of Investments [Line Items]      
Interest rate   9.00%  
Principal   $ 3,915  
Cost   3,876  
Fair value   $ 3,876  
Investment, Identifier [Axis]: Klein Hersh, LLC, Secured Debt November 13,2020      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.75%  
Interest, variable rate [9],[23]   7.00%  
Principal [9],[23]   $ 43,321  
Cost [9],[23]   42,342  
Fair value [9],[23]   $ 43,278  
Investment, Identifier [Axis]: Kore Wireless Group Inc., Secured Debt December 11, 2022      
Schedule of Investments [Line Items]      
Interest rate [11],[14] 9.17%    
Interest, variable rate [11],[14] 5.50%    
Principal [11],[14] $ 11,326    
Cost [11],[14] 11,275    
Fair value [11],[14] $ 11,199    
Investment, Identifier [Axis]: Kore Wireless Group Inc., Secured Debt December 31,2018      
Schedule of Investments [Line Items]      
Interest rate [13],[15]   5.72%  
Interest, variable rate [13],[15]   5.50%  
Principal [13],[15]   $ 11,415  
Cost [13],[15]   11,345  
Fair value [13],[15]   $ 11,400  
Investment, Identifier [Axis]: L.F. Manufacturing Holdings, LLC, Member Units December 23,2013      
Schedule of Investments [Line Items]      
Units (in shares)   2,179,001  
Cost   $ 2,019  
Fair value   $ 2,557  
Investment, Identifier [Axis]: L.F. Manufacturing Holdings, LLC, Preferred Member Units (non-voting) January 01,2019      
Schedule of Investments [Line Items]      
Interest rate [9],[27]   14.00%  
PIK Rate [9],[27]   14.00%  
Cost [9],[27]   $ 107  
Fair value [9],[27]   $ 107  
Investment, Identifier [Axis]: LKCM Headwater Investments I, L.P., LP Interests January 25, 2013      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 2.27%    
Cost [10],[11],[26],[36] $ 1,746    
Fair value [10],[11],[26],[36] $ 3,197    
Investment, Identifier [Axis]: LKCM Headwater Investments I, L.P., LP Interests January 25,2013      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[27],[37]   2.30%  
Cost [12],[13],[27],[37]   $ 1,746  
Fair value [12],[13],[27],[37]   $ 2,541  
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt May 02,2019      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.25%  
Interest, variable rate [9],[23]   7.25%  
Principal [9],[23]   $ 17,438  
Cost [9],[23]   17,309  
Fair value [9],[23]   $ 17,438  
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt One May 02, 2019      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 10.20%    
Interest, variable rate [8],[20],[21] 7.25%    
Principal [8],[20],[21] $ 8,126    
Cost [8],[20],[21] 8,102    
Fair value [8],[20],[21] $ 8,126    
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt Three May 12, 2019      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.13%    
Interest, variable rate [8],[20],[21] 7.25%    
Principal [8],[20],[21] $ 10,855    
Cost [8],[20],[21] 10,728    
Fair value [8],[20],[21] $ 10,799    
Investment, Identifier [Axis]: LL Management, Inc., Secured Debt Two May 02, 2019      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.81%    
Interest, variable rate [8],[20],[21] 7.25%    
Principal [8],[20],[21] $ 9,220    
Cost [8],[20],[21] 9,171    
Fair value [8] $ 9,220    
Investment, Identifier [Axis]: LLFlex, LLC, Secured Debt August 16, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 11.28%    
Interest, variable rate [8],[21] 9.00%    
Principal [8],[21] $ 4,455    
Cost [8],[21] 4,376    
Fair value [8],[21] $ 4,234    
Investment, Identifier [Axis]: LLFlex, LLC, Secured Debt August 16,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   10.00%  
Interest, variable rate [9],[23]   9.00%  
Principal [9],[23]   $ 4,478  
Cost [9],[23]   4,382  
Fair value [9],[23]   $ 4,382  
Investment, Identifier [Axis]: Laredo Energy, LLC, Member Units May 04,2020      
Schedule of Investments [Line Items]      
Units (in shares) [9]   1,155,952  
Cost [9]   $ 11,560  
Fair value [9]   $ 9,659  
Investment, Identifier [Axis]: LaserAway Intermediate Holdings II, LLC, Secured Debt October 18,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.50%  
Interest, variable rate [15],[23]   5.75%  
Principal [15],[23]   $ 4,130  
Cost [15],[23]   4,050  
Fair value [15],[23]   $ 4,115  
Investment, Identifier [Axis]: Lightbox Holdings, L.P., Secured Debt May 09, 2019      
Schedule of Investments [Line Items]      
Interest rate [14] 7.96%    
Interest, variable rate [14] 5.00%    
Principal [14] $ 14,513    
Cost [14] 14,377    
Fair value [14] $ 14,005    
Investment, Identifier [Axis]: Lightbox Holdings, L.P., Secured Debt May 23, 2019      
Schedule of Investments [Line Items]      
Interest rate [15]   5.22%  
Interest, variable rate [15]   5.00%  
Principal [15]   $ 14,625  
Cost [15]   14,460  
Fair value [15]   $ 14,442  
Investment, Identifier [Axis]: Logix Acquisition Company, LLC, Secured Debt January 08, 2018      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.87%    
Interest, variable rate [8],[21] 5.75%    
Principal [8],[21] $ 19,662    
Cost [8],[21] 18,954    
Fair value [8],[21] $ 17,941    
Investment, Identifier [Axis]: Logix Acquisition Company, LLC, Secured Debt January 08,2018      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   6.75%  
Interest, variable rate [9],[23]   5.75%  
Principal [9],[23]   $ 25,850  
Cost [9],[23]   24,605  
Fair value [9],[23]   $ 24,428  
Investment, Identifier [Axis]: Looking Glass Investments, LLC, Member Units July 01,2015      
Schedule of Investments [Line Items]      
Units (in shares) [12],[13]   3  
Cost [12],[13]   $ 125  
Fair value [12],[13]   $ 25  
Investment, Identifier [Axis]: Looking Glass Investments, LLC., Member Units July 01, 2015      
Schedule of Investments [Line Items]      
Units (in shares) [10],[11] 3    
Cost [10],[11] $ 125    
Fair value [10],[11] $ 25    
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC, Secured Debt January 28,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   7.00%  
Interest, variable rate [15],[23]   6.00%  
Principal [15],[23]   $ 11,682  
Cost [15],[23]   11,531  
Fair value [15],[23]   $ 11,682  
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC, Secured Debt One January 28,2021      
Schedule of Investments [Line Items]      
Interest rate [14],[20],[21],[49] 9.08%    
Interest, variable rate [14],[20],[21],[49] 6.00%    
Principal [14],[20],[21],[49] $ 6,816    
Cost [14],[20],[21],[49] 6,757    
Fair value [14],[20],[21],[49] $ 6,763    
Investment, Identifier [Axis]: MB2 Dental Solutions, LLC, Secured Debt Two January 28,2021      
Schedule of Investments [Line Items]      
Interest rate [14],[20],[21] 9.70%    
Interest, variable rate [14],[20],[21] 6.00%    
Principal [14],[20],[21] $ 7,896    
Cost [14],[20],[21] 7,799    
Fair value [14],[20],[21] $ 7,834    
Investment, Identifier [Axis]: MH Corbin Holding LLC, Preferred Member Units March 15,2019      
Schedule of Investments [Line Items]      
Units (in shares)   66,000  
Cost   $ 4,400  
Fair value   $ 0  
Investment, Identifier [Axis]: MH Corbin Holding LLC, Preferred Member Units One March 15, 2019      
Schedule of Investments [Line Items]      
Units (in shares) 66,000    
Cost $ 4,400    
Fair value $ 0    
Investment, Identifier [Axis]: MH Corbin Holding LLC, Preferred Member Units September 01, 2015      
Schedule of Investments [Line Items]      
Units (in shares) 4,000    
Cost $ 6,000    
Fair value $ 0    
Investment, Identifier [Axis]: MH Corbin Holding LLC, Preferred Member Units September 01,2015      
Schedule of Investments [Line Items]      
Units (in shares)   4,000  
Cost   $ 6,000  
Fair value   $ 0  
Investment, Identifier [Axis]: MH Corbin Holding LLC, Secured Debt August 31,2015      
Schedule of Investments [Line Items]      
Interest rate   13.00%  
Principal   $ 8,250  
Cost   8,241  
Fair value   $ 5,934  
Investment, Identifier [Axis]: MH Corbin Holding LLC, Secured Debt August 31, 2015      
Schedule of Investments [Line Items]      
Interest rate 13.00%    
Principal $ 6,236    
Cost 6,236    
Fair value $ 2,709    
Investment, Identifier [Axis]: MS Private Loan Fund I, LP Interests January 26, 2021      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 14.51%    
Cost [10],[11],[26],[36] $ 14,250    
Fair value [10],[11],[26],[36] 14,351    
Investment, Identifier [Axis]: MS Private Loan Fund I, LP Secured Debt January 26, 2021      
Schedule of Investments [Line Items]      
Principal [10],[11],[22] 0    
Cost [10],[11],[22] 0    
Fair value [10],[11],[22] $ 0    
Investment, Identifier [Axis]: MS Private Loan Fund I, LP, LP Interests January 26,2021      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[37]   12.10%  
Cost [12],[13],[37]   $ 2,500  
Fair value [12],[13],[37]   $ 2,581  
Investment, Identifier [Axis]: MS Private Loan Fund I, LP, Unsecured Debt February 11,2021      
Schedule of Investments [Line Items]      
Interest rate [12],[13]   5.00%  
Principal [12],[13]   $ 63,151  
Cost [12],[13]   63,151  
Fair value [12],[13]   63,151  
Investment, Identifier [Axis]: MSC Adviser I, LLC, Common Stock November 22, 2013      
Schedule of Investments [Line Items]      
Units (in shares) [26] 5,873    
Investment, Identifier [Axis]: MSC Adviser I, LLC, Member Units November 22, 2013      
Schedule of Investments [Line Items]      
Units (in shares) [26],[50] 1    
Cost [26],[50] $ 29,500    
Fair value [26],[50] $ 112,490    
Investment, Identifier [Axis]: MSC Adviser I, LLC, Member Units November 22,2013      
Schedule of Investments [Line Items]      
Cost [27],[51]   29,500  
Fair value [27],[51]   $ 140,400  
Investment, Identifier [Axis]: MSC Income Fund, Inc., Common Equity May 02, 2022      
Schedule of Investments [Line Items]      
Units (in shares) [10],[11],[26] 94,697    
Cost [10],[11],[26] $ 750    
Fair value [10],[11],[26] $ 761    
Investment, Identifier [Axis]: Mac Lean-Fogg Company, Preferred Stock October 01, 2019      
Schedule of Investments [Line Items]      
Interest rate [8] 13.75%    
PIK Rate [8] 9.25%    
Cost [8] $ 1,984    
Fair value [8] $ 1,926    
Investment, Identifier [Axis]: Mac Lean-Fogg Company, Preferred Stock October 01,2019      
Schedule of Investments [Line Items]      
Interest rate [9]   13.75%  
PIK Rate [9]   9.25%  
Cost [9]   $ 1,920  
Fair value [9]   $ 1,920  
Investment, Identifier [Axis]: Mac Lean-Fogg Company, Secured Debt April 22,2019      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   5.88%  
Interest, variable rate [9],[23]   5.25%  
Principal [9],[23]   $ 17,080  
Cost [9],[23]   16,995  
Fair value [9],[23]   $ 17,080  
Investment, Identifier [Axis]: Mac Lean-Fogg Company, Secured Debt One April 22, 2019      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 7.87%    
Interest, variable rate [8],[21] 4.75%    
Principal [8],[21] $ 1,786    
Cost [8],[21] 1,779    
Fair value [8],[21] $ 1,768    
Investment, Identifier [Axis]: Mac Lean-Fogg Company, Secured Debt Two April 22, 2019      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 7.87%    
Interest, variable rate [8],[21] 4.75%    
Principal [8],[21] $ 15,163    
Cost [8],[21] 15,102    
Fair value [8],[21] $ 15,011    
Investment, Identifier [Axis]: Mako Steel, LP, Secured Debt March 15,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.00%  
Interest, variable rate [9],[23]   7.25%  
Principal [9],[23]   $ 17,589  
Cost [9],[23]   17,267  
Fair value [9],[23]   $ 17,589  
Investment, Identifier [Axis]: Mako Steel, LP, Secured Debt One March 15, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.42%    
Interest, variable rate [8],[21] 7.25%    
Principal [8],[21] $ 1,643    
Cost [8],[21] 1,599    
Fair value [8],[21] $ 1,586    
Investment, Identifier [Axis]: Mako Steel, LP, Secured Debt Two March 15, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 11.09%    
Interest, variable rate [8],[21] 7.25%    
Principal [8],[21] $ 15,324    
Cost [8],[21] 15,107    
Fair value [8],[21] $ 14,791    
Investment, Identifier [Axis]: Market Force Information, LLC, Member Units July 28, 2017      
Schedule of Investments [Line Items]      
Units (in shares) 743,921    
Cost $ 16,642    
Fair value $ 0    
Investment, Identifier [Axis]: Market Force Information, LLC, Member Units July 28,2017      
Schedule of Investments [Line Items]      
Units (in shares)   743,921  
Cost   $ 16,642  
Fair value   $ 0  
Investment, Identifier [Axis]: Market Force Information, LLC, Secured Debt One July 28, 2017      
Schedule of Investments [Line Items]      
Interest rate [21] 13.38%    
Interest, variable rate [21] 11.00%    
Principal [21] $ 5,000    
Cost [21] 5,000    
Fair value [21] $ 5,000    
Investment, Identifier [Axis]: Market Force Information, LLC, Secured Debt One July 28,2017      
Schedule of Investments [Line Items]      
Interest rate [23]   12.00%  
Interest, variable rate [23]   11.00%  
Principal [23]   $ 3,400  
Cost [23]   3,400  
Fair value [23]   $ 3,400  
Investment, Identifier [Axis]: Market Force Information, LLC, Secured Debt Two July 28, 2017      
Schedule of Investments [Line Items]      
Interest rate [29] 12.00%    
PIK Rate [29] 12.00%    
Principal [29] $ 26,079    
Cost [29] 25,952    
Fair value [29] $ 2,871    
Investment, Identifier [Axis]: Market Force Information, LLC, Secured Debt Two July 28,2017      
Schedule of Investments [Line Items]      
Interest rate [30]   12.00%  
PIK Rate [30]   12.00%  
Principal [30]   $ 26,079  
Cost [30]   25,952  
Fair value [30]   $ 8,936  
Investment, Identifier [Axis]: Microbe Formulas, LLC, Secured Debt One April 04, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 6.25%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (66)    
Fair value [8],[20],[21],[22] $ (66)    
Investment, Identifier [Axis]: Microbe Formulas, LLC, Secured Debt Two April 04, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 8.36%    
Interest, variable rate [8],[20],[21] 6.25%    
Principal [8],[20],[21] $ 27,625    
Cost [8],[20],[21] 27,118    
Fair value [8],[20],[21] $ 25,665    
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC, Secured Debt October 24, 2018      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.06%    
Interest, variable rate [8],[21] 6.25%    
Principal [8],[21] $ 18,769    
Cost [8],[21] 18,533    
Fair value [8],[21] $ 18,309    
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC, Secured Debt October 24,2018      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.25%  
Interest, variable rate [9],[23]   6.25%  
Principal [9],[23]   $ 17,781  
Cost [9],[23]   17,563  
Fair value [9],[23]   $ 17,781  
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Common Stock August 30, 2022      
Schedule of Investments [Line Items]      
Units (in shares) [8],[11],[16] 44,445,814    
Cost [8],[11],[16] $ 889    
Fair value [8],[11],[16] $ 889    
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt One May 24, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[11],[16],[21],[22] 7.00%    
Principal [8],[11],[16],[21],[22] $ 0    
Cost [8],[11],[16],[21],[22] (68)    
Fair value [8],[11],[16],[21],[22] $ (68)    
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt Three May 24, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[11],[16],[21] 8.51%    
Interest, variable rate [8],[11],[16],[21] 7.00%    
Principal [8],[11],[16],[21] $ 17,038    
Cost [8],[11],[16],[21] 16,730    
Fair value [8],[11],[16],[21] $ 16,808    
Investment, Identifier [Axis]: MonitorUS Holding, LLC, Secured Debt Two May 24, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[11],[16],[21] 9.43%    
Interest, variable rate [8],[11],[16],[21] 7.00%    
Principal [8],[11],[16],[21] $ 10,107    
Cost [8],[11],[16],[21] 9,912    
Fair value [8],[11],[16],[21] 9,677    
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Common Stock August 18, 2014      
Schedule of Investments [Line Items]      
Cost [26] 2,720    
Fair value [26] 20,700    
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Common Stock August 18,2014      
Schedule of Investments [Line Items]      
Units (in shares) [27]   5,873  
Cost [27]   $ 2,720  
Fair value [27]   $ 8,840  
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Secured Debt August 18,2014      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 6,378  
Cost   6,377  
Fair value   $ 6,378  
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Secured Debt One August 18, 2014      
Schedule of Investments [Line Items]      
Principal [22] 0    
Cost [22] 0    
Fair value [22] $ 0    
Investment, Identifier [Axis]: Mystic Logistics Holdings, LLC, Secured Debt Two August 18, 2014      
Schedule of Investments [Line Items]      
Interest rate 10.00%    
Principal $ 5,746    
Cost 5,746    
Fair value $ 5,746    
Investment, Identifier [Axis]: NAPCO Precast, LLC, Member Units January 31, 2008      
Schedule of Investments [Line Items]      
Units (in shares) 2,955    
Cost $ 2,975    
Fair value $ 11,180    
Investment, Identifier [Axis]: NAPCO Precast, LLC, Member Units January 31,2008      
Schedule of Investments [Line Items]      
Units (in shares) [27]   2,955  
Cost [27]   $ 2,975  
Fair value [27]   $ 13,560  
Investment, Identifier [Axis]: NBG Acquisition Inc, Secured Debt April 28, 2017      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.67%    
Interest, variable rate [8],[21] 5.50%    
Principal [8],[21] $ 3,876    
Cost [8],[21] 3,859    
Fair value [8],[21] $ 1,841    
Investment, Identifier [Axis]: NBG Acquisition Inc, Secured Debt April 28,2017      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.50%  
Interest, variable rate [15],[23]   5.50%  
Principal [15],[23]   $ 3,987  
Cost [15],[23]   3,961  
Fair value [15],[23]   $ 2,758  
Investment, Identifier [Axis]: NNE Partners, LLC, Secured Debt March 02, 2017      
Schedule of Investments [Line Items]      
Interest rate [8] 10.86%    
Interest, variable rate [8] 9.25%    
Principal [8] $ 24,781    
Cost [8] 24,736    
Fair value [8] $ 24,073    
Investment, Identifier [Axis]: NNE Partners, LLC, Secured Debt March 02,2017      
Schedule of Investments [Line Items]      
Interest rate [9]   9.37%  
Interest, variable rate [9]   4.75%  
PIK Rate [9]   4.50%  
Principal [9]   $ 24,781  
Cost [9]   24,709  
Fair value [9]   $ 23,154  
Investment, Identifier [Axis]: NRP Jones, LLC, Member Units December 22, 2011      
Schedule of Investments [Line Items]      
Units (in shares) [26] 65,962    
Cost [26] $ 3,717    
Fair value [26] $ 4,790    
Investment, Identifier [Axis]: NRP Jones, LLC, Member Units December 22,2011      
Schedule of Investments [Line Items]      
Units (in shares) [27]   65,962  
Cost [27]   $ 3,717  
Fair value [27]   $ 6,440  
Investment, Identifier [Axis]: NRP Jones, LLC, Secured Debt December 21, 2017      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 2,080    
Cost 2,080    
Fair value $ 2,080    
Investment, Identifier [Axis]: NRP Jones, LLC, Secured Debt December 21,2017      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 2,080  
Cost   2,080  
Fair value   $ 2,080  
Investment, Identifier [Axis]: NTM Acquisition Corp., Secured Debt July 12, 2016      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.50%    
Interest, variable rate [8],[21] 6.25%    
PIK Rate [8],[21] 1.00%    
Principal [8],[21] $ 4,490    
Cost [8],[21] 4,490    
Fair value [8],[21] $ 4,333    
Investment, Identifier [Axis]: NTM Acquisition Corp., Secured Debt July 12,2016      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   8.25%  
Interest, variable rate [15],[23]   6.25%  
PIK Rate [15],[23]   1.00%  
Principal [15],[23]   $ 4,598  
Cost [15],[23]   4,598  
Fair value [15],[23]   $ 4,552  
Investment, Identifier [Axis]: NWN Corporation, Secured Debt May 07,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.50%  
Interest, variable rate [9],[23]   6.50%  
Principal [9],[23]   $ 42,972  
Cost [9],[23]   42,108  
Fair value [9],[23]   $ 42,323  
Investment, Identifier [Axis]: NWN Corporation, Secured Debt One May 07, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.27%    
Interest, variable rate [8],[21] 6.50%    
Principal [8],[21] $ 3,941    
Cost [8],[21] 3,832    
Fair value [8],[21] $ 3,715    
Investment, Identifier [Axis]: NWN Corporation, Secured Debt Two May 07, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.37%    
Interest, variable rate [8],[21] 6.50%    
Principal [8],[21] $ 40,615    
Cost [8],[21] 40,014    
Fair value [8],[21] $ 38,285    
Investment, Identifier [Axis]: Nebraska Vet AcquireCo, LLC, Preferred Member Units December 31, 2020      
Schedule of Investments [Line Items]      
Units (in shares) 6,987    
Cost $ 6,987    
Fair value $ 7,700    
Investment, Identifier [Axis]: Nebraska Vet AcquireCo, LLC, Preferred Member Units December 31,2020      
Schedule of Investments [Line Items]      
Units (in shares)   6,987  
Cost   $ 6,987  
Fair value   $ 7,700  
Investment, Identifier [Axis]: Nebraska Vet AcquireCo, LLC, Secured Debt One December 31,2020      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 10,500  
Cost   10,412  
Fair value   $ 10,412  
Investment, Identifier [Axis]: Nebraska Vet AcquireCo, LLC, Secured Debt Three December 31, 2020      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 10,500    
Cost 10,429    
Fair value $ 10,500    
Investment, Identifier [Axis]: Nebraska Vet AcquireCo, LLC, Secured Debt Two December 31, 2020      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 18,281    
Cost 18,160    
Fair value $ 18,281    
Investment, Identifier [Axis]: Nebraska Vet AcquireCo, LLC, Secured Debt Two December 31,2020      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 4,868  
Cost   4,829  
Fair value   $ 4,829  
Investment, Identifier [Axis]: NexRev LLC, Preferred Member Units February 28, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [26] 103,144,186    
Cost [26] $ 8,213    
Fair value [26] $ 1,110    
Investment, Identifier [Axis]: NexRev LLC, Preferred Member Units February 28,2018      
Schedule of Investments [Line Items]      
Units (in shares) [27]   86,400,000  
Cost [27]   $ 6,880  
Fair value [27]   $ 2,690  
Investment, Identifier [Axis]: NexRev LLC, Secured Debt February 28,2018      
Schedule of Investments [Line Items]      
Interest rate   11.00%  
Principal   $ 16,217  
Cost   16,173  
Fair value   $ 14,045  
Investment, Identifier [Axis]: NexRev LLC, Secured Debt One February 28, 2018      
Schedule of Investments [Line Items]      
Interest rate 11.00%    
Principal $ 160    
Cost 160    
Fair value $ 160    
Investment, Identifier [Axis]: NexRev LLC, Secured Debt Two February 28, 2018      
Schedule of Investments [Line Items]      
Interest rate 11.00%    
Principal $ 12,265    
Cost 12,110    
Fair value $ 9,053    
Investment, Identifier [Axis]: NinjaTrader, LLC, Secured Debt December 18,2019      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.25%  
Interest, variable rate [9],[23]   6.25%  
Principal [9],[23]   $ 31,425  
Cost [9],[23]   30,837  
Fair value [9],[23]   $ 31,368  
Investment, Identifier [Axis]: NinjaTrader, LLC, Secured Debt One December 18, 2019      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 6.75%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (2)    
Fair value [8],[21],[22] $ 0    
Investment, Identifier [Axis]: NinjaTrader, LLC, Secured Debt Three December 18, 2019      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.53%    
Interest, variable rate [8],[21] 6.75%    
Principal [8],[21] $ 21,666    
Cost [8],[21] 21,387    
Fair value [8],[21] $ 21,666    
Investment, Identifier [Axis]: NinjaTrader, LLC, Secured Debt Two December 18, 2019      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 6.75%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (43)    
Fair value [8],[21],[22] $ (43)    
Investment, Identifier [Axis]: Northstar Group Services, Inc, Secured Debt November 01, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.62%    
Interest, variable rate [8],[21] 5.50%    
Principal [8],[21] $ 9,742    
Cost [8],[21] 9,702    
Fair value [8],[21] $ 9,535    
Investment, Identifier [Axis]: Northstar Group Services, Inc, Secured Debt November 01,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.50%  
Interest, variable rate [15],[23]   5.50%  
Principal [15],[23]   $ 10,000  
Cost [15],[23]   9,952  
Fair value [15],[23]   $ 10,034  
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units January 31, 2017      
Schedule of Investments [Line Items]      
Units (in shares) 406    
Cost $ 10,200    
Fair value $ 10,200    
Investment, Identifier [Axis]: NuStep, LLC, Preferred Member Units January 31,2017      
Schedule of Investments [Line Items]      
Units (in shares)   406  
Cost   $ 10,200  
Fair value   $ 13,500  
Investment, Identifier [Axis]: NuStep, LLC, Secured Debt One January 31, 2017      
Schedule of Investments [Line Items]      
Interest rate [21] 9.13%    
Interest, variable rate [21] 6.50%    
Principal [21] $ 4,400    
Cost [21] 4,399    
Fair value [21] $ 4,399    
Investment, Identifier [Axis]: NuStep, LLC, Secured Debt One January 31,2017      
Schedule of Investments [Line Items]      
Interest rate [23]   7.50%  
Interest, variable rate [23]   6.50%  
Principal [23]   $ 1,720  
Cost [23]   1,720  
Fair value [23]   $ 1,720  
Investment, Identifier [Axis]: NuStep, LLC, Secured Debt Two January 31, 2017      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 18,440    
Cost 18,411    
Fair value $ 18,411    
Investment, Identifier [Axis]: NuStep, LLC, Secured Debt Two January 31,2017      
Schedule of Investments [Line Items]      
Interest rate   11.00%  
Principal   $ 17,240  
Cost   17,236  
Fair value   $ 17,240  
Investment, Identifier [Axis]: OMi Topco, LLC, Preferred Member Units April 01, 2008      
Schedule of Investments [Line Items]      
Units (in shares) [26] 900    
Cost [26] $ 1,080    
Fair value [26] $ 20,680    
Investment, Identifier [Axis]: OMi Topco, LLC, Preferred Member Units April 01,2008      
Schedule of Investments [Line Items]      
Units (in shares) [27]   900  
Cost [27]   $ 1,080  
Fair value [27]   $ 20,210  
Investment, Identifier [Axis]: OMi Topco, LLC, Secured Debt August 31, 2021      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 16,250    
Cost 16,122    
Fair value $ 16,250    
Investment, Identifier [Axis]: OMi Topco, LLC, Secured Debt August 31,2021      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 18,000  
Cost   17,831  
Fair value   $ 18,000  
Investment, Identifier [Axis]: OVG Business Services, LLC, Secured Debt November 29, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.34%    
Interest, variable rate [8],[21] 6.25%    
Principal [8],[21] $ 13,965    
Cost [8],[21] 13,843    
Fair value [8],[21] $ 13,057    
Investment, Identifier [Axis]: OVG Business Services, LLC, Secured Debt November 29,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.25%  
Interest, variable rate [9],[23]   6.25%  
Principal [9],[23]   $ 14,000  
Cost [9],[23]   13,861  
Fair value [9],[23]   $ 13,861  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Common Stock April 15, 2011      
Schedule of Investments [Line Items]      
Units (in shares) 635    
Cost $ 830    
Fair value $ 0    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Common Stock April 15,2021      
Schedule of Investments [Line Items]      
Units (in shares)   635  
Cost   $ 830  
Fair value   $ 0  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Preferred Stock April 18, 2011      
Schedule of Investments [Line Items]      
Units (in shares) [29] 912    
Interest rate [29] 7.00%    
PIK Rate [29] 7.00%    
Cost [29] $ 1,981    
Fair value [29] $ 0    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Preferred Stock April 18,2011      
Schedule of Investments [Line Items]      
Units (in shares)   912  
Interest rate   7.00%  
PIK Rate   7.00%  
Cost   $ 1,981  
Fair value   $ 0  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Secured Debt April 18, 2011      
Schedule of Investments [Line Items]      
Interest rate [29] 12.00%    
PIK Rate [29] 12.00%    
Principal [29] $ 4,415    
Cost [29] 4,415    
Fair value [29] $ 3,160    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Secured Debt April 18,2011      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
PIK Rate   12.00%  
Principal   $ 4,286  
Cost   4,286  
Fair value   $ 4,286  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Secured Debt March 21, 2014      
Schedule of Investments [Line Items]      
Interest rate [29] 12.00%    
PIK Rate [29] 12.00%    
Principal [29] $ 983    
Cost [29] 983    
Fair value [29] $ 703    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Secured Debt March 21,2014      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
PIK Rate   12.00%  
Principal   $ 954  
Cost   954  
Fair value   $ 954  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Secured Debt May 10, 2013      
Schedule of Investments [Line Items]      
Interest rate [29] 12.00%    
PIK Rate [29] 12.00%    
Principal [29] $ 2,116    
Cost [29] 2,116    
Fair value [29] $ 1,515    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Secured Debt May 10,2013      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
PIK Rate   12.00%  
Principal   $ 2,055  
Cost   2,055  
Fair value   $ 2,055  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Secured Debt May 20, 2014      
Schedule of Investments [Line Items]      
Interest rate [29] 12.00%    
PIK Rate [29] 12.00%    
Principal [29] $ 964    
Cost [29] 964    
Fair value [29] $ 690    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Secured Debt May 20,2014      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
PIK Rate   12.00%  
Principal   $ 935  
Cost   935  
Fair value   $ 935  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Unsecured Debt June 05, 2017      
Schedule of Investments [Line Items]      
Interest rate [29] 10.00%    
PIK Rate [29] 10.00%    
Principal [29] $ 197    
Cost [29] 197    
Fair value [29] $ 197    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Unsecured Debt June 05,2017      
Schedule of Investments [Line Items]      
Interest rate   10.00%  
PIK Rate   10.00%  
Principal   $ 192  
Cost   192  
Fair value   $ 192  
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Warrants April 18, 2011      
Schedule of Investments [Line Items]      
Units (in shares) [24] 4,699    
Cost [24] $ 1,089    
Fair value [24] $ 0    
Investment, Identifier [Axis]: OnAsset Intelligence, Inc., Warrants April 18,2011      
Schedule of Investments [Line Items]      
Units (in shares) [25]   4,699  
Cost [25]   $ 1,089  
Fair value [25]   $ 0  
Investment, Identifier [Axis]: Oneliance, LLC, Preferred Stock August 06, 2021      
Schedule of Investments [Line Items]      
Units (in shares) 1,056    
Cost $ 1,056    
Fair value $ 1,056    
Investment, Identifier [Axis]: Oneliance, LLC, Preferred Stock August 06,2021      
Schedule of Investments [Line Items]      
Units (in shares)   1,056  
Cost   $ 1,056  
Fair value   $ 1,056  
Investment, Identifier [Axis]: Oneliance, LLC, Secured Debt August 06,2021      
Schedule of Investments [Line Items]      
Interest rate [23]   12.00%  
Interest, variable rate [23]   11.00%  
Principal [23]   $ 5,600  
Cost [23]   5,547  
Fair value [23]   $ 5,547  
Investment, Identifier [Axis]: Oneliance, LLC, Secured Debt One August 06, 2021      
Schedule of Investments [Line Items]      
PIK Rate [21],[22] 11.00%    
Principal [21],[22] $ 0    
Cost [21],[22] 0    
Fair value [21],[22] $ 0    
Investment, Identifier [Axis]: Oneliance, LLC, Secured Debt Two August 06, 2021      
Schedule of Investments [Line Items]      
Interest rate [21] 13.56%    
PIK Rate [21] 11.00%    
Principal [21] $ 5,600    
Cost [21] 5,556    
Fair value [21] $ 5,556    
Investment, Identifier [Axis]: Orttech Holdings, LLC, Preferred Stock July 30, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [26],[35] 10,000    
Cost [26],[35] $ 10,000    
Fair value [26],[35] $ 10,000    
Investment, Identifier [Axis]: Orttech Holdings, LLC, Preferred Stock July 30,2021      
Schedule of Investments [Line Items]      
Units (in shares) [27],[34]   10,000  
Cost [27],[34]   $ 10,000  
Fair value [27],[34]   $ 10,000  
Investment, Identifier [Axis]: Orttech Holdings, LLC, Secured Debt July 30,2021      
Schedule of Investments [Line Items]      
Interest rate [23]   12.00%  
Interest, variable rate [23]   11.00%  
Principal [23]   $ 24,375  
Cost [23]   24,151  
Fair value [23]   $ 24,151  
Investment, Identifier [Axis]: Orttech Holdings, LLC, Secured Debt One July 30, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [21],[22] 11.00%    
Principal [21],[22] $ 0    
Cost [21],[22] 0    
Fair value [21],[22] $ 0    
Investment, Identifier [Axis]: Orttech Holdings, LLC, Secured Debt Two July 30, 2021      
Schedule of Investments [Line Items]      
Interest rate [21] 13.63%    
Interest, variable rate [21] 11.00%    
Principal [21] $ 23,600    
Cost [21] 23,417    
Fair value [21] $ 23,417    
Investment, Identifier [Axis]: Ospemifene Royalty Sub LLC, Secured Debt July 08, 2013      
Schedule of Investments [Line Items]      
Interest rate [8],[29] 11.50%    
Principal [8],[29] $ 4,511    
Cost [8],[29] 4,511    
Fair value [8],[29] $ 61    
Investment, Identifier [Axis]: Ospemifene Royalty Sub LLC, Secured Debt July 08,2013      
Schedule of Investments [Line Items]      
Interest rate [9],[28]   11.50%  
Principal [9],[28]   $ 4,562  
Cost [9],[28]   4,562  
Fair value [9],[28]   $ 112  
Investment, Identifier [Axis]: PPL RVs, Inc., Common Stock One June 10, 2010      
Schedule of Investments [Line Items]      
Units (in shares) [26] 2,000    
Cost [26] $ 2,150    
Fair value [26] $ 19,510    
Investment, Identifier [Axis]: PPL RVs, Inc., Common Stock Two June 14, 2022      
Schedule of Investments [Line Items]      
Units (in shares) 156,574    
Cost $ 157    
Fair value $ 157    
Investment, Identifier [Axis]: PPL RVs, Inc., Secured Debt November 15,2016      
Schedule of Investments [Line Items]      
Interest rate [23]   7.50%  
Interest, variable rate [23]   7.00%  
Principal [23]   $ 11,655  
Cost [23]   11,655  
Fair value [23]   $ 11,655  
Investment, Identifier [Axis]: PPL RVs, Inc., Secured Debt October 31,2019      
Schedule of Investments [Line Items]      
Interest rate [23]   7.50%  
Interest, variable rate [23]   7.00%  
Principal [23]   $ 750  
Cost [23]   726  
Fair value [23]   $ 726  
Investment, Identifier [Axis]: PPL RVs, Inc., Secured Debt One October 31, 2019      
Schedule of Investments [Line Items]      
Interest, variable rate [21],[22] 7.00%    
Principal [21],[22] $ 0    
Cost [21],[22] (9)    
Fair value [21],[22] $ (9)    
Investment, Identifier [Axis]: PPL RVs, Inc., Secured Debt Two November 15, 2016      
Schedule of Investments [Line Items]      
Interest rate [21] 8.75%    
Interest, variable rate [21] 7.00%    
Principal [21] $ 19,655    
Cost [21] 19,416    
Fair value [21] $ 19,655    
Investment, Identifier [Axis]: PPL RVs, Inc.,Common Stock June 10,2010      
Schedule of Investments [Line Items]      
Units (in shares) [27]   2,000  
Cost [27]   $ 2,150  
Fair value [27]   $ 14,360  
Investment, Identifier [Axis]: PT Network, LLC, Common Stock January 01,2020      
Schedule of Investments [Line Items]      
Units (in shares) [9]   2  
Cost [9]   $ 0  
Fair value [9]   $ 80  
Investment, Identifier [Axis]: PT Network, LLC, Secured Debt October 12,2017      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.50%  
Interest, variable rate [9],[23]   5.50%  
PIK Rate [9],[23]   2.00%  
Principal [9],[23]   $ 8,889  
Cost [9],[23]   8,889  
Fair value [9],[23]   $ 8,889  
Investment, Identifier [Axis]: PTL US Bidco, Inc, Secured Debt One August 19, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 8.25%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (184)    
Fair value [8],[20],[21],[22] $ (184)    
Investment, Identifier [Axis]: PTL US Bidco, Inc, Secured Debt Two August 19, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 11.40%    
Interest, variable rate [8],[20],[21] 8.25%    
Principal [8],[20],[21] $ 28,625    
Cost [8],[20],[21] 28,074    
Fair value [8],[20],[21] $ 28,074    
Investment, Identifier [Axis]: Paragon Healthcare, Inc., Secured Debt One January 19, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 5.75%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (111)    
Fair value [8],[20],[21],[22] $ (111)    
Investment, Identifier [Axis]: Paragon Healthcare, Inc., Secured Debt Three January 19, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 8.40%    
Interest, variable rate [8],[20],[21] 5.75%    
Principal [8],[20],[21] $ 18,293    
Cost [8],[20],[21] 17,825    
Fair value [8],[20],[21] $ 17,330    
Investment, Identifier [Axis]: Paragon Healthcare, Inc., Secured Debt Two January 19, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 8.45%    
Interest, variable rate [8],[20],[21] 5.75%    
Principal [8],[20],[21] $ 1,620    
Cost [8],[20],[21] 1,523    
Fair value [8],[20],[21] $ 1,534    
Investment, Identifier [Axis]: Pearl Meyer Topco LLC, Member Units April 27, 2020      
Schedule of Investments [Line Items]      
Units (in shares) [26] 13,800    
Cost [26] $ 13,000    
Fair value [26] 41,820    
Investment, Identifier [Axis]: Pearl Meyer Topco LLC, Member Units April 27,2020      
Schedule of Investments [Line Items]      
Units (in shares) [27]   13,800  
Cost [27]   $ 13,000  
Fair value [27]   $ 26,970  
Investment, Identifier [Axis]: Pearl Meyer Topco LLC, Secured Debt April 27,2020      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 32,674  
Cost   32,438  
Fair value   $ 32,674  
Investment, Identifier [Axis]: Pearl Meyer Topco LLC, Secured Debt One April 27, 2020      
Schedule of Investments [Line Items]      
Principal [22] 0    
Cost [22] 0    
Fair value [22] $ 0    
Investment, Identifier [Axis]: Pearl Meyer Topco LLC, Secured Debt Three April 27, 2020      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 28,681    
Cost 28,521    
Fair value $ 28,681    
Investment, Identifier [Axis]: Principle Environmental, LLC, Common Stock January 27, 2021      
Schedule of Investments [Line Items]      
Units (in shares) 1,037    
Cost $ 1,200    
Fair value $ 790    
Investment, Identifier [Axis]: Principle Environmental, LLC, Common Stock January 27,2021      
Schedule of Investments [Line Items]      
Units (in shares)   1,037  
Cost   $ 1,200  
Fair value   $ 710  
Investment, Identifier [Axis]: Principle Environmental, LLC, Preferred Member Units February 01, 2011      
Schedule of Investments [Line Items]      
Units (in shares) [26] 21,806    
Cost [26] $ 5,709    
Fair value [26] $ 12,230    
Investment, Identifier [Axis]: Principle Environmental, LLC, Preferred Member Units February 01,2011      
Schedule of Investments [Line Items]      
Units (in shares)   21,806  
Cost   $ 5,709  
Fair value   $ 11,160  
Investment, Identifier [Axis]: Principle Environmental, LLC, Secured Debt February 01,2011      
Schedule of Investments [Line Items]      
Interest rate   13.00%  
Principal   $ 1,473  
Cost   1,465  
Fair value   $ 1,465  
Investment, Identifier [Axis]: Principle Environmental, LLC, Secured Debt July 01,2011      
Schedule of Investments [Line Items]      
Interest rate   13.00%  
Principal   $ 5,924  
Cost   5,808  
Fair value   $ 5,808  
Investment, Identifier [Axis]: Principle Environmental, LLC, Secured Debt Two February 01, 2011      
Schedule of Investments [Line Items]      
Interest rate 13.00%    
Principal $ 5,897    
Cost 5,800    
Fair value $ 5,800    
Investment, Identifier [Axis]: Project Eagle Holdings, LLC, Secured Debt July 06,2020      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.75%  
Interest, variable rate [9],[23]   6.75%  
Principal [9],[23]   $ 29,738  
Cost [9],[23]   29,151  
Fair value [9],[23]   $ 29,714  
Investment, Identifier [Axis]: Project Eagle Holdings, LLC, Secured Debt One July 06, 2020      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 6.50%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (20)    
Fair value [8],[21],[22] $ (20)    
Investment, Identifier [Axis]: Project Eagle Holdings, LLC, Secured Debt Two July 06, 2020      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.33%    
Interest, variable rate [8],[21] 6.50%    
Principal [8],[21] $ 29,550    
Cost [8],[21] 29,083    
Fair value [8],[21] $ 28,831    
Investment, Identifier [Axis]: Quality Lease Service, LLC, Member Units June 08, 2015      
Schedule of Investments [Line Items]      
Units (in shares) 1,000    
Cost $ 7,613    
Fair value $ 625    
Investment, Identifier [Axis]: Quality Lease Service, LLC, Member Units June 08,2015      
Schedule of Investments [Line Items]      
Units (in shares)   1,000  
Cost   $ 9,213  
Fair value   $ 2,149  
Investment, Identifier [Axis]: RA Outdoors LLC, Secured Debt April 08,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.75%  
Interest, variable rate [9],[23]   6.75%  
Principal [9],[23]   $ 19,374  
Cost [9],[23]   19,193  
Fair value [9],[23]   $ 18,352  
Investment, Identifier [Axis]: RA Outdoors LLC, Secured Debt One April 08, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 6.75%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (12)    
Fair value [8],[20],[21],[22] $ (12)    
Investment, Identifier [Axis]: RA Outdoors LLC, Secured Debt Two April 08, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.03%    
Interest, variable rate [8],[20],[21] 6.75%    
Principal [8],[20],[21] $ 13,369    
Cost [8],[20],[21] 13,231    
Fair value [8],[20],[21] $ 12,252    
Investment, Identifier [Axis]: RM Bidder, LLC, Member Units November 12,2015      
Schedule of Investments [Line Items]      
Units (in shares) [9]   2,779  
Cost [9]   $ 46  
Fair value [9]   $ 26  
Investment, Identifier [Axis]: RM Bidder, LLC, Warrants November 12,2015      
Schedule of Investments [Line Items]      
Units (in shares) [9],[52]   187,161  
Cost [9],[52]   $ 425  
Fair value [9],[52]   $ 0  
Investment, Identifier [Axis]: RM Bidder, LLC., Member Units November 12, 2015      
Schedule of Investments [Line Items]      
Units (in shares) [8] 2,779    
Cost [8] $ 46    
Fair value [8] $ 24    
Investment, Identifier [Axis]: RM Bidder, LLC., Warrants November 12, 2015      
Schedule of Investments [Line Items]      
Units (in shares) [8],[53] 187,161    
Cost [8],[53] $ 425    
Fair value [8],[53] $ 0    
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Secured Debt One September 01, 2020      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.59%    
Interest, variable rate [8],[21] 7.75%    
Principal [8],[21] $ 2,534    
Cost [8],[21] 2,514    
Fair value [8],[21] $ 2,417    
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Secured Debt September 01,2020      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   9.00%  
Interest, variable rate [9],[23]   7.75%  
Principal [9],[23]   $ 18,191  
Cost [9],[23]   17,997  
Fair value [9],[23]   $ 18,191  
Investment, Identifier [Axis]: RTIC Subsidiary Holdings, LLC, Secured Debt Two September 01, 2020      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.03%    
Interest, variable rate [8],[21] 7.75%    
Principal [8],[21] $ 16,838    
Cost [8],[21] 16,708    
Fair value [8],[21] $ 16,062    
Investment, Identifier [Axis]: Research Now Group, Inc. and Survey Sampling International, LLC, Secured Debt December 29, 2017      
Schedule of Investments [Line Items]      
Interest rate [14],[20],[21] 8.84%    
Interest, variable rate [14],[20],[21] 5.50%    
Principal [14],[20],[21] $ 19,966    
Cost [14],[20],[21] 19,717    
Fair value [14],[20],[21] $ 18,128    
Investment, Identifier [Axis]: Research Now Group, Inc. and Survey Sampling International, LLC, Secured Debt December 29,2017      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.50%  
Interest, variable rate [15],[23]   5.50%  
Principal [15],[23]   $ 20,124  
Cost [15],[23]   19,789  
Fair value [15],[23]   $ 19,899  
Investment, Identifier [Axis]: River Aggregates, LLC, Member Units December 20, 2013      
Schedule of Investments [Line Items]      
Units (in shares) [35] 1,500    
Cost [35] $ 369    
Fair value [35] $ 3,460    
Investment, Identifier [Axis]: River Aggregates, LLC, Member Units December 20,2013      
Schedule of Investments [Line Items]      
Units (in shares) [27],[34]   1,500  
Cost [27],[34]   $ 369  
Fair value [27],[34]   $ 3,280  
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc., Preferred Equity December 15, 2021      
Schedule of Investments [Line Items]      
Units (in shares) 11,070    
Cost $ 11,070    
Fair value $ 15,210    
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc., Preferred Equity December 15,2021      
Schedule of Investments [Line Items]      
Units (in shares)   11,070  
Cost   $ 11,070  
Fair value   $ 11,070  
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc., Secured Debt December 15,2021      
Schedule of Investments [Line Items]      
Interest rate [23]   12.00%  
Interest, variable rate [23]   11.00%  
Principal [23]   $ 36,360  
Cost [23]   35,956  
Fair value [23]   $ 35,956  
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc., Secured Debt One December 15, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [21],[22] 11.00%    
Principal [21],[22] $ 0    
Cost [21],[22] (38)    
Fair value [21],[22] $ (38)    
Investment, Identifier [Axis]: Robbins Bros. Jewelry, Inc., Secured Debt Two December 15, 2021      
Schedule of Investments [Line Items]      
Interest rate [21] 13.63%    
Interest, variable rate [21] 11.00%    
Principal [21] $ 35,910    
Cost [21] 35,609    
Fair value [21] $ 35,609    
Investment, Identifier [Axis]: Rocaceia, LLC (Quality Lease and Rental Holdings, LLC), Preferred Member Units January 08,2013      
Schedule of Investments [Line Items]      
Units (in shares)   250  
Cost   $ 2,500  
Fair value   $ 0  
Investment, Identifier [Axis]: Rocaceia, LLC (Quality Lease and Rental Holdings, LLC), Secured Debt June 30,2015      
Schedule of Investments [Line Items]      
Interest rate [28],[30],[54]   12.00%  
Principal [28],[30],[54]   $ 30,369  
Cost [28],[30],[54]   29,865  
Fair value [28],[30],[54]   $ 0  
Investment, Identifier [Axis]: Rocaceia, LLC Preferred Member Unit January 08, 2013      
Schedule of Investments [Line Items]      
Units (in shares) 250    
Cost $ 2,500    
Fair value $ 0    
Investment, Identifier [Axis]: Rocaceia, LLC Secured Debt June 30, 2015      
Schedule of Investments [Line Items]      
Interest rate [29],[33],[55] 12.00%    
Principal [29],[33],[55] $ 30,369    
Cost [29],[33],[55] 29,865    
Fair value [29],[33],[55] $ 0    
Investment, Identifier [Axis]: Roof Opco, LLC, Secured Debt August 27,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.00%  
Interest, variable rate [9],[23]   6.00%  
Principal [9],[23]   $ 2,800  
Cost [9],[23]   2,704  
Fair value [9],[23]   $ 2,704  
Investment, Identifier [Axis]: Roof Opco, LLC, Secured Debt One August 27, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 6.50%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (12)    
Fair value [8],[21],[22] $ (12)    
Investment, Identifier [Axis]: Roof Opco, LLC, Secured Debt Three August 27, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.78%    
Interest, variable rate [8],[21] 6.50%    
Principal [8],[21] $ 3,173    
Cost [8],[21] 3,122    
Fair value [8],[21] $ 3,087    
Investment, Identifier [Axis]: Roof Opco, LLC, Secured Debt Two August 27, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.78%    
Interest, variable rate [8],[21] 6.50%    
Principal [8],[21] $ 2,333    
Cost [8],[21] 2,288    
Fair value [8],[21] $ 2,270    
Investment, Identifier [Axis]: Rug Doctor, LLC., Secured Debt July 16,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.25%  
Interest, variable rate [9],[23]   6.25%  
Principal [9],[23]   $ 11,145  
Cost [9],[23]   10,902  
Fair value [9],[23]   $ 10,902  
Investment, Identifier [Axis]: Rug Doctor, LLC., Secured Debt One July 16, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 11.99%    
Interest, variable rate [8],[20],[21] 8.25%    
PIK Rate [8],[20],[21] 2.00%    
Principal [8],[20],[21] $ 5,625    
Cost [8],[20],[21] 5,585    
Fair value [8],[20],[21] $ 5,033    
Investment, Identifier [Axis]: Rug Doctor, LLC., Secured Debt Two July 16, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 11.99%    
Interest, variable rate [8],[20],[21] 8.25%    
PIK Rate [8],[20],[21] 2.00%    
Principal [8],[20],[21] $ 8,340    
Cost [8],[20],[21] 8,207    
Fair value [8],[20],[21] $ 7,462    
Investment, Identifier [Axis]: SI East, LLC, Preferred Member Units August 31, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [26] 157    
Cost [26] $ 1,218    
Fair value [26] $ 14,950    
Investment, Identifier [Axis]: SI East, LLC, Preferred Member Units August 31,2018      
Schedule of Investments [Line Items]      
Units (in shares) [27]   157  
Cost [27]   $ 1,218  
Fair value [27]   $ 11,570  
Investment, Identifier [Axis]: SI East, LLC, Secured Debt August 31,2018      
Schedule of Investments [Line Items]      
Interest rate   10.25%  
Principal   $ 65,850  
Cost   65,738  
Fair value   $ 65,850  
Investment, Identifier [Axis]: SI East, LLC, Senior Debt One August 31, 2018      
Schedule of Investments [Line Items]      
Interest rate 10.25%    
Principal $ 2,250    
Cost 2,250    
Fair value $ 2,250    
Investment, Identifier [Axis]: SI East, LLC, Senior Debt Two August 31, 2018      
Schedule of Investments [Line Items]      
Interest rate 10.25%    
Principal $ 93,236    
Cost 93,124    
Fair value $ 93,236    
Investment, Identifier [Axis]: SIB Holdings, LLC, Common Equity October 29, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [8] 95,238    
Cost [8] $ 200    
Fair value [8] $ 200    
Investment, Identifier [Axis]: SIB Holdings, LLC, Common Equity October 29,2021      
Schedule of Investments [Line Items]      
Units (in shares) [9]   95,238  
Cost [9]   $ 200  
Fair value [9]   $ 200  
Investment, Identifier [Axis]: SIB Holdings, LLC, Secured Debt October 29,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.00%  
Interest, variable rate [9],[23]   6.00%  
Principal [9],[23]   $ 6,282  
Cost [9],[23]   6,134  
Fair value [9],[23]   $ 6,145  
Investment, Identifier [Axis]: SIB Holdings, LLC, Secured Debt One October 29, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 8.81%    
Interest, variable rate [8],[20],[21] 6.25%    
Principal [8],[20],[21] $ 323    
Cost [8],[20],[21] 314    
Fair value [8],[20],[21] $ 298    
Investment, Identifier [Axis]: SIB Holdings, LLC, Secured Debt Three October 29, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 8.14%    
Interest, variable rate [8],[20],[21] 6.25%    
Principal [8],[20],[21] $ 7,845    
Cost [8],[20],[21] 7,712    
Fair value [8],[20],[21] $ 7,238    
Investment, Identifier [Axis]: SIB Holdings, LLC, Secured Debt Two October 29, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 8.81%    
Interest, variable rate [8],[20],[21] 6.25%    
Principal [8],[20],[21] $ 1,573    
Cost [8],[20],[21] 1,545    
Fair value [8],[20],[21] $ 1,451    
Investment, Identifier [Axis]: SPAU Holdings, LLC, Common Stock July 01, 2022      
Schedule of Investments [Line Items]      
Units (in shares) [8] 638,710    
Cost [8] $ 639    
Fair value [8] $ 639    
Investment, Identifier [Axis]: SPAU Holdings, LLC, Secured Debt One July 01, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 7.50%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (61)    
Fair value [8],[20],[21],[22] $ (61)    
Investment, Identifier [Axis]: SPAU Holdings, LLC, Secured Debt Two July 01, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.58%    
Interest, variable rate [8],[20],[21] 7.50%    
Principal [8],[20],[21] $ 15,968    
Cost [8],[20],[21] 15,664    
Fair value [8],[20],[21] $ 15,664    
Investment, Identifier [Axis]: Salient Partners L.P., Secured Debt August 31,2018      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   7.00%  
Interest, variable rate [15],[23]   6.00%  
Principal [15],[23]   $ 6,251  
Cost [15],[23]   6,247  
Fair value [15],[23]   $ 4,063  
Investment, Identifier [Axis]: Salient Partners L.P., Secured Debt One August 31, 2018      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 9.67%    
Interest, variable rate [14],[21] 6.00%    
Principal [14],[21] $ 6,251    
Cost [14],[21] 6,250    
Fair value [14],[21] $ 5,039    
Investment, Identifier [Axis]: Salient Partners L.P., Secured Debt Two September 30, 2021      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 9.67%    
Interest, variable rate [14],[21] 6.00%    
Principal [14],[21] $ 1,250    
Cost [14],[21] 1,250    
Fair value [14],[21] $ 2,494    
Investment, Identifier [Axis]: Savers, Inc., Secured Debt May 14, 2021      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 9.17%    
Interest, variable rate [14],[21] 5.50%    
Principal [14],[21] $ 11,315    
Cost [14],[21] 11,223    
Fair value [14],[21] $ 10,918    
Investment, Identifier [Axis]: Savers, Inc., Secured Debt May 14,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.25%  
Interest, variable rate [15],[23]   5.50%  
Principal [15],[23]   $ 11,400  
Cost [15],[23]   11,295  
Fair value [15],[23]   $ 11,386  
Investment, Identifier [Axis]: Slick Innovations, LLC, Common Stock September 13, 2018      
Schedule of Investments [Line Items]      
Units (in shares) 70,000    
Cost $ 700    
Fair value $ 1,640    
Investment, Identifier [Axis]: Slick Innovations, LLC, Common Stock September 13,2018      
Schedule of Investments [Line Items]      
Units (in shares)   70,000  
Cost   $ 700  
Fair value   $ 1,510  
Investment, Identifier [Axis]: Slick Innovations, LLC, Secured Debt September 13, 2018      
Schedule of Investments [Line Items]      
Interest rate 11.00%    
Principal $ 4,240    
Cost 4,209    
Fair value $ 4,240    
Investment, Identifier [Axis]: Slick Innovations, LLC, Secured Debt September 13,2018      
Schedule of Investments [Line Items]      
Interest rate   13.00%  
Principal   $ 5,320  
Cost   5,248  
Fair value   $ 5,320  
Investment, Identifier [Axis]: Slick Innovations, LLC, Warrants September 13, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [24] 18,084    
Cost [24] $ 181    
Fair value [24] $ 440    
Investment, Identifier [Axis]: Slick Innovations, LLC, Warrants September 13,2018      
Schedule of Investments [Line Items]      
Units (in shares) [25]   18,084  
Cost [25]   $ 181  
Fair value [25]   $ 400  
Investment, Identifier [Axis]: Sonic Systems International, LLC, Common Stock August 20, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [8] 9,968    
Cost [8] $ 1,356    
Fair value [8] $ 1,420    
Investment, Identifier [Axis]: Sonic Systems International, LLC, Common Stock August 20,2021      
Schedule of Investments [Line Items]      
Units (in shares) [9]   7,866  
Cost [9]   $ 1,070  
Fair value [9]   $ 1,070  
Investment, Identifier [Axis]: Sonic Systems International, LLC, Secured Debt August 20, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.78%    
Interest, variable rate [8],[21] 7.50%    
Principal [8],[21] $ 15,769    
Cost [8],[21] 15,510    
Fair value [8],[21] $ 15,613    
Investment, Identifier [Axis]: Sonic Systems International, LLC, Secured Debt August 20,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.50%  
Interest, variable rate [9],[23]   7.50%  
Principal [9],[23]   $ 11,982  
Cost [9],[23]   11,757  
Fair value [9],[23]   $ 11,757  
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC, Common Equity December 10, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [8] 863,636    
Cost [8] $ 864    
Fair value [8] $ 1,068    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC, Common Equity December 10,2021      
Schedule of Investments [Line Items]      
Units (in shares) [9]   863,636  
Cost [9]   $ 864  
Fair value [9]   $ 864  
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC, Secured Debt December 10,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.25%  
Interest, variable rate [9],[23]   6.25%  
Principal [9],[23]   $ 50,704  
Cost [9],[23]   49,589  
Fair value [9],[23]   $ 49,589  
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC, Secured Debt One December 10, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 5.75%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (75)    
Fair value [8],[21],[22] $ (75)    
Investment, Identifier [Axis]: South Coast Terminals Holdings, LLC, Secured Debt Two December 10, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.74%    
Interest, variable rate [8],[21] 5.75%    
Principal [8],[21] $ 41,359    
Cost [8],[21] 40,664    
Fair value [8],[21] $ 40,772    
Investment, Identifier [Axis]: Staples Canada ULC, Secured Debt September 14, 2017      
Schedule of Investments [Line Items]      
Interest rate [8],[11],[16],[21],[56] 10.19%    
Interest, variable rate [8],[11],[16],[21],[56] 7.00%    
Principal [8],[11],[16],[21],[56] $ 14,334    
Cost [8],[11],[16],[21],[56] 14,286    
Fair value [8],[11],[16],[21],[56] $ 12,816    
Investment, Identifier [Axis]: Staples Canada ULC, Secured Debt September 14,2017      
Schedule of Investments [Line Items]      
Interest rate [9],[13],[23],[45],[57]   8.00%  
Interest, variable rate [9],[13],[23],[45],[57]   7.00%  
Principal [9],[13],[23],[45],[57]   $ 16,116  
Cost [9],[13],[23],[45],[57]   16,039  
Fair value [9],[13],[23],[45],[57]   $ 15,620  
Investment, Identifier [Axis]: Stellant Systems, Inc., Secured Debt October 22, 2021      
Schedule of Investments [Line Items]      
Interest rate [14],[20],[21] 8.41%    
Interest, variable rate [14],[20],[21] 5.50%    
Principal [14],[20],[21] $ 7,642    
Cost [14],[20],[21] 7,576    
Fair value [14],[20],[21] $ 7,107    
Investment, Identifier [Axis]: Stellant Systems, Inc., Secured Debt October 22,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.25%  
Interest, variable rate [15],[23]   5.50%  
Principal [15],[23]   $ 7,700  
Cost [15],[23]   7,625  
Fair value [15],[23]   $ 7,700  
Investment, Identifier [Axis]: Student Resource Center, LLC, Secured Debt June 25,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   9.00%  
Interest, variable rate [9],[23]   8.00%  
Principal [9],[23]   $ 10,969  
Cost [9],[23]   10,753  
Fair value [9],[23]   $ 10,826  
Investment, Identifier [Axis]: Student Resource Center, LLC, Secured Debt One June 15, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 8.00%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (11)    
Fair value [8],[21],[22] $ (11)    
Investment, Identifier [Axis]: Student Resource Center, LLC, Secured Debt Three September 30, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 11.75%    
Interest, variable rate [8],[21] 9.50%    
Principal [8],[21] $ 4,338    
Cost [8],[21] 4,271    
Fair value [8],[21] $ 1,286    
Investment, Identifier [Axis]: Student Resource Center, LLC, Secured Debt Two September 30, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 10.25%    
Interest, variable rate [8],[21] 7.00%    
Principal [8],[21] $ 6,250    
Cost [8],[21] 6,156    
Fair value [8],[21] $ 5,141    
Investment, Identifier [Axis]: Superior Rigging & Erecting Co., Preferred Member Units August 31, 2020      
Schedule of Investments [Line Items]      
Units (in shares) 1,571    
Cost $ 4,500    
Fair value $ 4,500    
Investment, Identifier [Axis]: Superior Rigging & Erecting Co., Preferred Member Units August 31,2020      
Schedule of Investments [Line Items]      
Units (in shares)   1,571  
Cost   $ 4,500  
Fair value   $ 4,500  
Investment, Identifier [Axis]: Superior Rigging & Erecting Co., Secured Debt August 31, 2020      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 21,500    
Cost 21,367    
Fair value $ 21,367    
Investment, Identifier [Axis]: Superior Rigging & Erecting Co., Secured Debt August 31,2020      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 21,500  
Cost   21,332  
Fair value   $ 21,332  
Investment, Identifier [Axis]: Tacala Investment Corp., Secured Debt March 19,2021      
Schedule of Investments [Line Items]      
Interest rate [23],[58]   4.25%  
Interest, variable rate [23],[58]   3.50%  
PIK Rate   2.00%  
Principal [23],[58]   $ 1,995  
Cost [23],[58]   1,995  
Fair value [23],[58]   $ 1,994  
Investment, Identifier [Axis]: Tacala Investment Corp., Secured Debt May 19, 2021      
Schedule of Investments [Line Items]      
Interest rate [21],[59],[60] 6.62%    
Interest, variable rate [21],[59],[60] 3.50%    
Principal [21],[59],[60] $ 1,979    
Cost [21],[59],[60] 1,979    
Fair value [21],[59],[60] $ 1,855    
Investment, Identifier [Axis]: Team Public Choices, LLC, Secured Debt December 22, 2020      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 7.81%    
Interest, variable rate [14],[21] 5.00%    
Principal [14],[21] $ 15,002    
Cost [14],[21] 14,714    
Fair value [14],[21] $ 14,327    
Investment, Identifier [Axis]: Team Public Choices, LLC, Secured Debt December 22,2020      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.00%  
Interest, variable rate [15],[23]   5.00%  
Principal [15],[23]   $ 15,109  
Cost [15],[23]   14,778  
Fair value [15],[23]   $ 15,071  
Investment, Identifier [Axis]: Tectonic Financial, LLC, Common Stock May 15,2017      
Schedule of Investments [Line Items]      
Units (in shares) [27]   200,000  
Cost [27]   $ 2,000  
Fair value [27]   $ 4,650  
Investment, Identifier [Axis]: Tectonic Financial, LLC., Common Stock May 15, 2017      
Schedule of Investments [Line Items]      
Units (in shares) [26] 200,000    
Cost [26] $ 2,000    
Fair value [26] $ 5,630    
Investment, Identifier [Axis]: Tedder Industries, LLC, Preferred Member Units August 31, 2018      
Schedule of Investments [Line Items]      
Units (in shares) 533    
Cost $ 9,068    
Fair value $ 7,137    
Investment, Identifier [Axis]: Tedder Industries, LLC, Preferred Member Units August 31,2018      
Schedule of Investments [Line Items]      
Units (in shares)   505  
Cost   $ 8,579  
Fair value   $ 8,579  
Investment, Identifier [Axis]: Tedder Industries, LLC, Secured Debt August 31,2018      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 16,240  
Cost   16,181  
Fair value   $ 16,181  
Investment, Identifier [Axis]: Tedder Industries, LLC, Secured Debt One August 31, 2018      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 1,840    
Cost 1,840    
Fair value $ 1,840    
Investment, Identifier [Axis]: Tedder Industries, LLC, Secured Debt Two August 31, 2018      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 15,200    
Cost 15,188    
Fair value $ 15,117    
Investment, Identifier [Axis]: Televerde, LLC, Member Units January 06, 2011      
Schedule of Investments [Line Items]      
Units (in shares) 460    
Cost $ 1,290    
Fair value $ 5,204    
Investment, Identifier [Axis]: Televerde, LLC, Member Units January 06,2011      
Schedule of Investments [Line Items]      
Units (in shares)   460  
Cost   $ 1,290  
Fair value   $ 7,280  
Investment, Identifier [Axis]: Televerde, LLC, Preferred Stock January 26, 2022      
Schedule of Investments [Line Items]      
Units (in shares) 248    
Cost $ 718    
Fair value $ 1,794    
Investment, Identifier [Axis]: Tex Tech Tennis, LLC, Common Stock July 07,2021      
Schedule of Investments [Line Items]      
Units (in shares) [9],[34]   1,000,000  
Cost [9],[34]   $ 1,000  
Fair value [9],[34]   $ 1,000  
Investment, Identifier [Axis]: Tex Tech Tennis, LLC., Common Stock July 07, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [8],[35] 1,000,000    
Cost [8],[35] $ 1,000    
Fair value [8],[35] $ 1,380    
Investment, Identifier [Axis]: The Affiliati Network, LLC, Preferred Stock August 09,2021      
Schedule of Investments [Line Items]      
Units (in shares) [27]   1,280,000  
Cost [27]   $ 6,400  
Fair value [27]   $ 6,400  
Investment, Identifier [Axis]: The Affiliati Network, LLC, Secured Debt August 09,2021      
Schedule of Investments [Line Items]      
Interest rate   7.00%  
Principal   $ 280  
Cost   262  
Fair value   $ 262  
Investment, Identifier [Axis]: The Affiliati Network, LLC, Secured Debt One August 09,2021      
Schedule of Investments [Line Items]      
Interest rate   11.83%  
Principal   $ 12,961  
Cost   12,834  
Fair value   $ 12,834  
Investment, Identifier [Axis]: The Affiliati Network, LLC., Preferred Stock August 09, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [26] 1,280,000    
Cost [26] $ 6,400    
Fair value [26] 6,400    
Investment, Identifier [Axis]: The Affiliati Network, LLC., Secured Debt August 09, 2021      
Schedule of Investments [Line Items]      
Cost [22] (15)    
Fair value [22] (15)    
Investment, Identifier [Axis]: The Affiliati Network, LLC., Secured Debt One August 09, 2021      
Schedule of Investments [Line Items]      
Principal [22] $ 0    
Investment, Identifier [Axis]: The Affiliati Network, LLC., Secured Debt Two August 09, 2021      
Schedule of Investments [Line Items]      
Interest rate 13.00%    
Principal $ 11,241    
Cost 11,149    
Fair value $ 11,149    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC, Common Stock May 31, 2019      
Schedule of Investments [Line Items]      
Units (in shares) [26] 615    
Cost [26] $ 4,655    
Fair value [26] 7,420    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC, Common Stock May 31,2019      
Schedule of Investments [Line Items]      
Units (in shares) [27]   615  
Cost [27]   $ 4,655  
Fair value [27]   $ 8,660  
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC, Secured Debt May 31,2019      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 8,720  
Cost   8,663  
Fair value   $ 8,712  
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC, Secured Debt One May 31, 2019      
Schedule of Investments [Line Items]      
Principal [22] 0    
Cost [22] (5)    
Fair value [22] $ (5)    
Investment, Identifier [Axis]: Trantech Radiator Topco, LLC, Secured Debt Two May 31, 2019      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 8,320    
Cost 8,288    
Fair value $ 8,320    
Investment, Identifier [Axis]: U.S. TelePacific Corp., Secured Debt May 17, 2017      
Schedule of Investments [Line Items]      
Interest rate [14],[20],[21] 11.57%    
Interest, variable rate [14],[20],[21] 8.50%    
PIK Rate [14],[20],[21] 7.25%    
Principal [14],[20],[21] $ 18,018    
Cost [14],[20],[21] 17,945    
Fair value [14],[20],[21] $ 7,838    
Investment, Identifier [Axis]: U.S. TelePacific Corp., Secured Debt May 17,2017      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   7.00%  
Interest, variable rate [15],[23]   6.00%  
Principal [15],[23]   $ 17,088  
Cost [15],[23]   16,985  
Fair value [15],[23]   $ 12,917  
Investment, Identifier [Axis]: USA DeBusk LLC, Secured Debt October 22, 2019      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.27%    
Interest, variable rate [8],[21] 5.75%    
Principal [8],[21] $ 33,747    
Cost [8],[21] 33,161    
Fair value [8],[21] $ 33,110    
Investment, Identifier [Axis]: USA DeBusk LLC, Secured Debt October 22,2019      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   6.75%  
Interest, variable rate [9],[23]   5.75%  
Principal [9],[23]   $ 37,281  
Cost [9],[23]   36,510  
Fair value [9],[23]   $ 37,281  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Common Stock April 01,2020      
Schedule of Investments [Line Items]      
Units (in shares) [15]   945,507  
Cost [15]   $ 0  
Fair value [15]   $ 0  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred Stock August 21,2018      
Schedule of Investments [Line Items]      
Units (in shares) [15]   1,521,122  
Interest rate [15]   20.00%  
PIK Rate [15]   20.00%  
Cost [15]   $ 2,188  
Fair value [15]   $ 1,498  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred Stock August 29,2019      
Schedule of Investments [Line Items]      
Units (in shares) [15],[27]   1,133,102  
Interest rate [15],[27]   20.00%  
PIK Rate [15],[27]   20.00%  
Cost [15],[27]   $ 1,757  
Fair value [15],[27]   $ 2,833  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred Stock January 15,2015      
Schedule of Investments [Line Items]      
Units (in shares) [15]   4,336,866  
Interest rate [15]   13.50%  
PIK Rate [15]   13.50%  
Cost [15]   $ 7,924  
Fair value [15]   $ 0  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Preferred Stock June 30,2017      
Schedule of Investments [Line Items]      
Units (in shares) [15]   2,281,682  
Interest rate [15]   19.00%  
PIK Rate [15]   19.00%  
Cost [15]   $ 3,667  
Fair value [15]   $ 0  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Secured Convertible Debt January 01,2021      
Schedule of Investments [Line Items]      
Interest rate [15]   15.00%  
PIK Rate [15]   15.00%  
Principal [15]   $ 1,197  
Cost [15]   1,197  
Fair value [15]   $ 2,375  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Secured Debt August 27,2018      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   8.50%  
Interest, variable rate [15],[23]   5.50%  
PIK Rate [15],[23]   2.00%  
Principal [15],[23]   $ 1,986  
Cost [15],[23]   1,974  
Fair value [15],[23]   $ 1,852  
Investment, Identifier [Axis]: UniTek Global Services, Inc., Secured Debt October 15,2018      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   8.50%  
Interest, variable rate [15],[23]   5.50%  
PIK Rate [15],[23]   2.00%  
Principal [15],[23]   $ 397  
Cost [15],[23]   396  
Fair value [15],[23]   $ 371  
Investment, Identifier [Axis]: UniTek Global Services, Inc.., Common Stock April 01, 2020      
Schedule of Investments [Line Items]      
Units (in shares) [14] 945,507    
Cost [14] $ 0    
Fair value [14] $ 0    
Investment, Identifier [Axis]: UniTek Global Services, Inc.., Preferred Stock August 21, 2018      
Schedule of Investments [Line Items]      
Units (in shares) [14] 1,521,122    
Interest rate [14] 20.00%    
PIK Rate [14] 20.00%    
Cost [14] $ 2,188    
Fair value [14] $ 1,651    
Investment, Identifier [Axis]: UniTek Global Services, Inc.., Preferred Stock August 29, 2019      
Schedule of Investments [Line Items]      
Units (in shares) [14],[26] 1,133,102    
Interest rate [14],[26] 20.00%    
PIK Rate [14],[26] 20.00%    
Cost [14],[26] $ 2,037    
Fair value [14],[26] $ 2,833    
Investment, Identifier [Axis]: UniTek Global Services, Inc.., Preferred Stock January 15, 2015      
Schedule of Investments [Line Items]      
Units (in shares) [14] 4,336,866    
Interest rate [14] 13.50%    
PIK Rate [14] 13.50%    
Cost [14] $ 7,924    
Fair value [14] $ 0    
Investment, Identifier [Axis]: UniTek Global Services, Inc.., Preferred Stock June 30, 2017      
Schedule of Investments [Line Items]      
Units (in shares) [14] 2,281,682    
Interest rate [14] 19.00%    
PIK Rate [14] 19.00%    
Cost [14] $ 3,667    
Fair value [14] $ 0    
Investment, Identifier [Axis]: UniTek Global Services, Inc.., Secured Convertible Debt January 1, 2018      
Schedule of Investments [Line Items]      
Interest rate [14] 15.00%    
PIK Rate [14] 15.00%    
Principal [14] $ 2,312    
Cost [14] 2,312    
Fair value [14] $ 4,271    
Investment, Identifier [Axis]: UniTek Global Services, Inc.., Secured Debt August 27, 2018      
Schedule of Investments [Line Items]      
Interest rate [14],[20],[21] 10.76%    
Interest, variable rate [14],[20],[21] 5.50%    
PIK Rate [14],[20],[21] 2.00%    
Principal [14],[20],[21] $ 1,804    
Cost [14],[20],[21] 1,793    
Fair value [14],[20],[21] $ 1,701    
Investment, Identifier [Axis]: UniTek Global Services, Inc.., Secured Debt October 15, 2018      
Schedule of Investments [Line Items]      
Interest rate [14],[20],[21] 10.76%    
Interest, variable rate [14],[20],[21] 5.50%    
PIK Rate [14],[20],[21] 2.00%    
Principal [14],[20],[21] $ 403    
Cost [14],[20],[21] 403    
Fair value [14],[20],[21] $ 380    
Investment, Identifier [Axis]: UnionRock Energy Fund II, LP, LP Interests June 15, 2020      
Schedule of Investments [Line Items]      
Units (percentage) [10],[11],[26],[36] 11.11%    
Cost [10],[11],[26],[36] $ 3,123    
Fair value [10],[11],[26],[36] $ 5,354    
Investment, Identifier [Axis]: UnionRock Energy Fund II, LP, LP Interests June 15,2020      
Schedule of Investments [Line Items]      
Units (percentage) [12],[13],[27],[37]   49.60%  
Cost [12],[13],[27],[37]   $ 3,828  
Fair value [12],[13],[27],[37]   $ 6,122  
Investment, Identifier [Axis]: Universal Wellhead Services Holdings, LLC, Member Units December 07, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [8],[35] 4,000,000    
Cost [8],[35] $ 4,000    
Fair value [8],[35] $ 0    
Investment, Identifier [Axis]: Universal Wellhead Services Holdings, LLC, Member Units December 07,2016      
Schedule of Investments [Line Items]      
Units (in shares) [9],[34]   4,000,000  
Cost [9],[34]   $ 4,000  
Fair value [9],[34]   $ 0  
Investment, Identifier [Axis]: Universal Wellhead Services Holdings, LLC, Preferred Member Units December 07, 2016      
Schedule of Investments [Line Items]      
Units (in shares) [8],[35] 716,949    
Interest rate [8],[35] 14.00%    
PIK Rate [8],[35] 14.00%    
Cost [8],[35] $ 1,032    
Fair value [8],[35] $ 0    
Investment, Identifier [Axis]: Universal Wellhead Services Holdings, LLC, Preferred Member Units December 07,2016      
Schedule of Investments [Line Items]      
Units (in shares) [9],[34]   716,949  
Interest rate [9],[34]   14.00%  
PIK Rate [9],[34]   14.00%  
Cost [9],[34]   $ 1,032  
Fair value [9],[34]   $ 0  
Investment, Identifier [Axis]: VORTEQ Coil Finishers, LLC, Common Equity November 30, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [8],[26] 1,038,462    
Cost [8],[26] $ 1,038    
Fair value [8],[26] $ 3,110    
Investment, Identifier [Axis]: VORTEQ Coil Finishers, LLC, Common Equity November 30,2021      
Schedule of Investments [Line Items]      
Units (in shares) [9]   1,038,462  
Cost [9]   $ 1,038  
Fair value [9]   $ 1,038  
Investment, Identifier [Axis]: VORTEQ Coil Finishers, LLC, Secured Debt November 30, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.75%    
Interest, variable rate [8],[21] 7.25%    
Principal [8],[21] $ 25,475    
Cost [8],[21] 25,049    
Fair value [8],[21] $ 25,375    
Investment, Identifier [Axis]: VORTEQ Coil Finishers, LLC, Secured Debt November 30,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.50%  
Interest, variable rate [9],[23]   7.50%  
Principal [9],[23]   $ 25,962  
Cost [9],[23]   25,450  
Fair value [9],[23]   $ 25,450  
Investment, Identifier [Axis]: VVS Holdco LLC, Preferred Equity December 01, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [26],[35] 11,840    
Cost [26],[35] $ 11,840    
Fair value [26],[35] $ 12,078    
Investment, Identifier [Axis]: VVS Holdco LLC, Preferred Equity December 01,2021      
Schedule of Investments [Line Items]      
Units (in shares) [34]   11,840  
Cost [34]   $ 11,840  
Fair value [34]   $ 11,840  
Investment, Identifier [Axis]: VVS Holdco LLC, Secured Debt One December 01, 2021      
Schedule of Investments [Line Items]      
Interest rate [21],[35] 8.63%    
Interest, variable rate [21],[35] 6.00%    
Principal [21],[35] $ 800    
Cost [21],[35] 773    
Fair value [21],[35] $ 773    
Investment, Identifier [Axis]: VVS Holdco LLC, Secured Debt One December 01,2021      
Schedule of Investments [Line Items]      
Interest rate [23],[34]   7.00%  
Interest, variable rate [23],[34]   6.00%  
Principal [23],[34]   $ 1,200  
Cost [23],[34]   1,170  
Fair value [23],[34]   $ 1,169  
Investment, Identifier [Axis]: VVS Holdco LLC, Secured Debt Two December 01, 2021      
Schedule of Investments [Line Items]      
Interest rate [35] 11.50%    
Principal [35] $ 30,400    
Cost [35] 30,144    
Fair value [35] $ 30,146    
Investment, Identifier [Axis]: VVS Holdco LLC, Secured Debt Two December 01,2021      
Schedule of Investments [Line Items]      
Interest rate [34]   11.50%  
Principal [34]   $ 30,400  
Cost [34]   30,100  
Fair value [34]   $ 30,100  
Investment, Identifier [Axis]: Veregy Consolidated, Inc., Secured Debt November 09, 2020      
Schedule of Investments [Line Items]      
Interest, variable rate [14],[21],[22] 5.25%    
Principal [14],[21],[22] $ 0    
Cost [14],[21],[22] (685)    
Fair value [14],[21],[22] $ (685)    
Investment, Identifier [Axis]: Veregy Consolidated, Inc., Secured Debt November 09,2020      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.25%  
Interest, variable rate [15],[23]   5.25%  
Principal [15],[23]   $ 5,875  
Cost [15],[23]   5,111  
Fair value [15],[23]   $ 5,111  
Investment, Identifier [Axis]: Veregy Consolidated, Inc., Secured Debt One November 09,2020      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   7.00%  
Interest, variable rate [15],[23]   6.00%  
Principal [15],[23]   $ 14,888  
Cost [15],[23]   14,524  
Fair value [15],[23]   $ 14,925  
Investment, Identifier [Axis]: Veregy Consolidated, Inc., Secured Debt Two November 09, 2020      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 8.81%    
Interest, variable rate [14],[21] 6.00%    
Principal [14],[21] $ 17,685    
Cost [14],[21] 17,365    
Fair value [14],[21] $ 16,845    
Investment, Identifier [Axis]: Vida Capital, Inc, Secured Debt October 10, 2019      
Schedule of Investments [Line Items]      
Interest rate [14] 9.12%    
Interest, variable rate [14] 6.00%    
Principal [14] $ 15,794    
Cost [14] 15,648    
Fair value [14] $ 12,372    
Investment, Identifier [Axis]: Vida Capital, Inc, Secured Debt October 10,2019      
Schedule of Investments [Line Items]      
Interest rate [15]   6.10%  
Interest, variable rate [15]   6.00%  
Principal [15]   $ 17,089  
Cost [15]   16,905  
Fair value [15]   $ 15,850  
Investment, Identifier [Axis]: Vision Interest, Inc., Series A Preferred Stock December 23, 2011      
Schedule of Investments [Line Items]      
Units (in shares) [26] 3,000,000    
Cost [26] $ 3,000    
Fair value [26] $ 3,000    
Investment, Identifier [Axis]: Vision Interests, Inc., Series A Preferred Stock December 23,2011      
Schedule of Investments [Line Items]      
Units (in shares)   3,000,000  
Cost   $ 3,000  
Fair value   $ 3,000  
Investment, Identifier [Axis]: Vistar Media, Inc., Preferred Stock April 03, 2019      
Schedule of Investments [Line Items]      
Units (in shares) [8] 70,207    
Cost [8] $ 767    
Fair value [8] $ 2,350    
Investment, Identifier [Axis]: Vistar Media, Inc., Preferred Stock April 03,2019      
Schedule of Investments [Line Items]      
Units (in shares) [9]   70,207  
Cost [9]   $ 767  
Fair value [9]   $ 1,726  
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units January 26,2015      
Schedule of Investments [Line Items]      
Units (in shares)   4,876,670  
Cost   $ 14,000  
Fair value   $ 5,990  
Investment, Identifier [Axis]: Volusion, LLC, Preferred Member Units, January 26, 2015      
Schedule of Investments [Line Items]      
Units (in shares) 4,876,670    
Cost $ 14,000    
Fair value $ 0    
Investment, Identifier [Axis]: Volusion, LLC, Secured Debt January 26, 2015      
Schedule of Investments [Line Items]      
Interest rate [33] 11.50%    
Principal [33] $ 16,734    
Cost [33] 16,734    
Fair value [33] $ 16,630    
Investment, Identifier [Axis]: Volusion, LLC, Secured Debt January 26,2015      
Schedule of Investments [Line Items]      
Interest rate [30]   11.50%  
Principal [30]   $ 17,434  
Cost [30]   17,434  
Fair value [30]   $ 17,434  
Investment, Identifier [Axis]: Volusion, LLC, Unsecured Convertible Debt May 16, 2018      
Schedule of Investments [Line Items]      
Interest rate 8.00%    
Principal $ 409    
Cost 409    
Fair value $ 409    
Investment, Identifier [Axis]: Volusion, LLC, Unsecured Convertible Debt May 16,2018      
Schedule of Investments [Line Items]      
Interest rate   8.00%  
Principal   $ 409  
Cost   409  
Fair value   $ 409  
Investment, Identifier [Axis]: Volusion, LLC, Warrants January 26,2015      
Schedule of Investments [Line Items]      
Units (in shares) [25]   1,831,355  
Cost [25]   $ 2,576  
Fair value [25]   $ 0  
Investment, Identifier [Axis]: Volusion, LLC, Warrants, January 26, 2015      
Schedule of Investments [Line Items]      
Units (in shares) [24] 1,831,355    
Cost [24] $ 2,576    
Fair value [24] $ 0    
Investment, Identifier [Axis]: Wahoo Fitness Acquisition L.L.C., Secured Debt August 17, 2021      
Schedule of Investments [Line Items]      
Interest rate [14],[20],[21] 9.57%    
Interest, variable rate [14],[20],[21] 5.75%    
Principal [14],[20],[21] $ 14,719    
Cost [14],[20],[21] 14,344    
Fair value [14],[20],[21] $ 9,935    
Investment, Identifier [Axis]: Wahoo Fitness Acquisition L.L.C., Secured Debt August 17,2021      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.75%  
Interest, variable rate [15],[23]   5.75%  
Principal [15],[23]   $ 15,000  
Cost [15],[23]   14,569  
Fair value [15],[23]   $ 14,916  
Investment, Identifier [Axis]: Wall Street Prep, Inc., Common Stock July 19, 2021      
Schedule of Investments [Line Items]      
Units (in shares) [8] 400,000    
Cost [8] $ 400    
Fair value [8] $ 310    
Investment, Identifier [Axis]: Wall Street Prep, Inc., Common Stock July 19,2021      
Schedule of Investments [Line Items]      
Units (in shares) [9]   400,000  
Cost [9]   $ 400  
Fair value [9]   $ 400  
Investment, Identifier [Axis]: Wall Street Prep, Inc., Secured Debt July 19,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   8.00%  
Interest, variable rate [9],[23]   7.00%  
Principal [9],[23]   $ 4,373  
Cost [9],[23]   4,288  
Fair value [9],[23]   $ 4,285  
Investment, Identifier [Axis]: Wall Street Prep, Inc., Secured Debt One July 19, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 7.00%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (6)    
Fair value [8],[21],[22] $ (6)    
Investment, Identifier [Axis]: Wall Street Prep, Inc., Secured Debt Two July 19, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.28%    
Interest, variable rate [8],[21] 7.00%    
Principal [8],[21] $ 4,290    
Cost [8],[21] 4,223    
Fair value [8],[21] $ 4,072    
Investment, Identifier [Axis]: Watterson Brands, LLC, Secured Debt December 17,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   7.25%  
Interest, variable rate [9],[23]   6.25%  
Principal [9],[23]   $ 25,876  
Cost [9],[23]   25,267  
Fair value [9],[23]   $ 25,267  
Investment, Identifier [Axis]: Watterson Brands, LLC, Secured Debt One December 17, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.63%    
Interest, variable rate [8],[21] 6.00%    
Principal [8],[21] $ 371    
Cost [8],[21] 332    
Fair value [8],[21] $ 359    
Investment, Identifier [Axis]: Watterson Brands, LLC, Secured Debt Three December 17, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.25%    
Interest, variable rate [8],[21] 6.00%    
Principal [8],[21] $ 28,957    
Cost [8],[21] 28,568    
Fair value [8],[21] $ 28,056    
Investment, Identifier [Axis]: Watterson Brands, LLC, Secured Debt Two December 17, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 8.25%    
Interest, variable rate [8],[21] 6.00%    
Principal [8],[21] $ 391    
Cost [8],[21] 359    
Fair value [8],[21] $ 379    
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Common Stock March 01, 2022      
Schedule of Investments [Line Items]      
Units (in shares) [8] 1,541,400    
Cost [8] $ 1,541    
Fair value [8] $ 1,620    
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Secured Debt One March 01, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 8.59%    
Interest, variable rate [8],[20],[21] 6.00%    
Principal [8],[20],[21] $ 10,794    
Cost [8],[20],[21] 10,599    
Fair value [8],[20],[21] $ 10,294    
Investment, Identifier [Axis]: West Star Aviation Acquisition, LLC, Secured Debt Two March 01, 2022      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[20],[21],[22] 6.00%    
Principal [8],[20],[21],[22] $ 0    
Cost [8],[20],[21],[22] (21)    
Fair value [8],[20],[21],[22] $ (21)    
Investment, Identifier [Axis]: Winter Services LLC, Secured Debt One November 19, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 7.00%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (36)    
Fair value [8],[21],[22] $ 0    
Investment, Identifier [Axis]: Winter Services LLC, Secured Debt Three November 19, 2021      
Schedule of Investments [Line Items]      
Interest rate [8],[21] 9.23%    
Interest, variable rate [8],[21] 7.00%    
Principal [8],[21] $ 10,000    
Cost [8],[21] 9,834    
Fair value [8],[21] $ 9,683    
Investment, Identifier [Axis]: Winter Services LLC, Secured Debt Two November 19, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[21],[22] 7.00%    
Principal [8],[21],[22] $ 0    
Cost [8],[21],[22] (18)    
Fair value [8],[21],[22] $ (18)    
Investment, Identifier [Axis]: Xenon Arc, Inc, Secured Debt December 17,2021      
Schedule of Investments [Line Items]      
Interest rate [9],[23]   6.75%  
Interest, variable rate [9],[23]   6.00%  
Principal [9],[23]   $ 38,600  
Cost [9],[23]   37,423  
Fair value [9],[23]   $ 37,423  
Investment, Identifier [Axis]: Xenon Arc, Inc., Secured Debt One December 17, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[22] 5.25%    
Principal [8],[22] $ 0    
Cost [8],[22] (138)    
Fair value [8],[22] $ (138)    
Investment, Identifier [Axis]: Xenon Arc, Inc., Secured Debt Three December 17, 2021      
Schedule of Investments [Line Items]      
Interest rate [8] 8.63%    
Interest, variable rate [8] 5.25%    
Principal [8] $ 38,311    
Cost [8] 37,660    
Fair value [8] $ 36,845    
Investment, Identifier [Axis]: Xenon Arc, Inc., Secured Debt Two December 17, 2021      
Schedule of Investments [Line Items]      
Interest, variable rate [8],[22] 5.25%    
Principal [8],[22] $ 0    
Cost [8],[22] (206)    
Fair value [8],[22] $ (206)    
Investment, Identifier [Axis]: YS Garments, LLC, Secured Debt August 22, 2018      
Schedule of Investments [Line Items]      
Interest rate [14],[21] 7.92%    
Interest, variable rate [14],[21] 5.50%    
Principal [14],[21] $ 12,659    
Cost [14],[21] 12,613    
Fair value [14],[21] $ 12,121    
Investment, Identifier [Axis]: YS Garments, LLC, Secured Debt August 22,2018      
Schedule of Investments [Line Items]      
Interest rate [15],[23]   6.50%  
Interest, variable rate [15],[23]   5.50%  
Principal [15],[23]   $ 13,034  
Cost [15],[23]   12,967  
Fair value [15],[23]   $ 12,578  
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC, Preferred Member Units June 30, 2015      
Schedule of Investments [Line Items]      
Units (in shares) 10,072    
Cost $ 2,834    
Fair value $ 1,190    
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC, Preferred Member Units June 30,2015      
Schedule of Investments [Line Items]      
Units (in shares)   10,072  
Cost   $ 2,834  
Fair value   $ 2,130  
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC, Secured Debt June 01,2015      
Schedule of Investments [Line Items]      
Interest rate   12.00%  
Principal   $ 625  
Cost   625  
Fair value   $ 625  
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC, Secured Debt One June 01, 2015      
Schedule of Investments [Line Items]      
Interest rate 12.00%    
Principal $ 450    
Cost 450    
Fair value $ 450    
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC, Secured Debt One October 01,2008      
Schedule of Investments [Line Items]      
Interest rate   6.50%  
Principal   $ 1,000  
Cost   1,000  
Fair value   $ 1,000  
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC, Secured Debt Three October 01, 2008      
Schedule of Investments [Line Items]      
Interest rate 14.00%    
Principal $ 2,750    
Cost 2,750    
Fair value $ 2,676    
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC, Secured Debt Two October 01, 2008      
Schedule of Investments [Line Items]      
Interest rate 6.50%    
Principal $ 1,000    
Cost 1,000    
Fair value $ 1,000    
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC, Secured Debt Two October 01,2008      
Schedule of Investments [Line Items]      
Interest rate   14.00%  
Principal   $ 2,750  
Cost   2,750  
Fair value   $ 2,750  
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC, Warrants July 01, 2015      
Schedule of Investments [Line Items]      
Units (in shares) [24] 587    
Cost [24] $ 600    
Fair value [24] $ 0    
Investment, Identifier [Axis]: Ziegler’s NYPD, LLC, Warrants July 01,2015      
Schedule of Investments [Line Items]      
Units (in shares) [25]   587  
Cost [25]   $ 600  
Fair value [25]   $ 0  
Investment, Identifier [Axis]: Zips Car Wash, LLC, Secured Debt One February 11, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21] 9.94%    
Interest, variable rate [8],[20],[21] 7.25%    
Principal [8],[20],[21] $ 17,512    
Cost [8],[20],[21] 17,229    
Fair value [8],[20],[21] $ 17,284    
Investment, Identifier [Axis]: Zips Car Wash, LLC, Secured Debt Two February 11, 2022      
Schedule of Investments [Line Items]      
Interest rate [8],[20],[21],[60] 9.86%    
Interest, variable rate [8],[20],[21],[60] 7.25%    
Principal [8],[20],[21],[60] $ 4,389    
Cost [8],[20],[21],[60] 4,354    
Fair value [8],[20],[21],[60] $ 4,289    
[1] All investments are Lower Middle Market portfolio investments, unless otherwise noted. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of Lower Middle Market portfolio investments. All of the Company’s investments, unless otherwise noted, are encumbered either as security for the Company’s Credit Facility or in support of the SBA-guaranteed debentures issued by the Funds.
[2] All portfolio company headquarters are based in the United States, unless otherwise noted.
[3] Principal is net of repayments. Cost is net of repayments and accumulated unearned income.
[4] All portfolio company headquarters are based in the United States, unless otherwise noted.
[5] Principal is net of repayments. Cost is net of repayments and accumulated unearned income. Negative cost is the result of the capitalized discount being greater than the principal amount outstanding on the loan.
[6] Investment fair value was determined using significant unobservable inputs, unless otherwise noted. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for further discussion.
[7] Investment fair value was determined using significant unobservable inputs, unless otherwise noted. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for further discussion. Negative fair value is the result of the capitalized discount on the loan or the unfunded commitment being valued below par.
[8] Private Loan portfolio investment. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of Private Loan portfolio investments.
[9] Private Loan portfolio investment. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of Private Loan portfolio investments.
[10] Other Portfolio investment. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of Other Portfolio investments.
[11] Investment is not a qualifying asset as defined under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets.
[12] Other Portfolio investment. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of Other Portfolio investments.
[13] Investment is not a qualifying asset as defined under Section 55(a) of the 1940 Act. Qualifying assets must represent at least 70% of total assets at the time of acquisition of any additional non-qualifying assets.
[14] Middle Market portfolio investment. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of Middle Market portfolio investments.
[15] Middle Market portfolio investment. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of Middle Market portfolio investments.
[16] Portfolio company headquarters are located outside of the United States.
[17] Control investments are defined by the 1940 Act as investments in which more than 25% of the voting securities are owned or where the ability to nominate greater than 50% of the board representation is maintained.
[18] Affiliate investments are defined by the 1940 Act as investments in which between 5% and 25% (inclusive) of the voting securities are owned and the investments are not classified as Control investments.
[19] Non-Control/Non-Affiliate investments are defined by the 1940 Act as investments that are neither Control investments nor Affiliate investments.
[20] A majority of the variable rate loans in the Company’s investment portfolio bear interest at a rate that may be determined by reference to either LIBOR (“L”), SOFR (“SF”) or an alternate Base Rate (commonly based on the Federal Funds Rate or the Prime Rate (“P”)), which typically resets every one, three, or six months at the borrower’s option. SOFR based contracts may include a credit spread adjustment (the “Adjustment”) that is charged in addition to the stated spread. The Adjustment is applied when the SOFR rate, plus the Adjustment, exceeds the stated floor rate, as applicable. As of September 30, 2022, SOFR based contracts in the portfolio had Adjustments ranging from 0.10% to 0.26%.
[21] Index based floating interest rate is subject to contractual minimum interest rate. As noted in this schedule, 70% of the loans (based on the par amount) contain LIBOR or Term SOFR (“SOFR”) floors which range between 0.50% and 2.00%, with a weighted-average floor of 1.06%.
[22] The position is unfunded and no interest income is being earned as of September 30, 2022. The position may earn a nominal unused facility fee on committed amounts.
[23] Index based floating interest rate is subject to contractual minimum interest rate. As noted in this schedule, 67% of the loans (based on the par amount) contain LIBOR floors which range between 0.50% and 2.00%, with a weighted-average LIBOR floor of 1.06%.
[24] Warrants are presented in equivalent shares/units with a strike price of $0.01 per share/unit.
[25] Warrants are presented in equivalent shares/units with a strike price of $0.01 per share/unit.
[26] Income producing through dividends or distributions.
[27] Income producing through dividends or distributions.
[28] Non-accrual and non-income producing investment.
[29] Non-accrual and non-income producing investment.
[30] Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
[31] The Company has entered into an intercreditor agreement that entitles the Company to the “last out” tranche of the first lien secured loans, whereby the “first out” tranche will receive priority as to the “last out” tranche with respect to payments of principal, interest, and any other amounts due thereunder. Therefore, the Company receives a higher interest rate than the contractual stated interest rate of Prime plus 5.10% (Floor 2.00%) per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.
[32] The Company has entered into an intercreditor agreement that entitles the Company to the “last out” tranche of the first lien secured loans, whereby the “first out” tranche will receive priority as to the “last out” tranche with respect to payments of principal, interest, and any other amounts due thereunder. Therefore, the Company receives a higher interest rate than the contractual stated interest rate of LIBOR plus 7.25% (Floor 1.25%) per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.
[33] Maturity date is under on-going negotiations with the portfolio company and other lenders, if applicable.
[34] Shares/Units represent ownership in a related Real Estate or HoldCo entity.
[35] Shares/Units represent ownership in a related Real Estate or HoldCo entity.
[36] Investment is not unitized. Presentation is made in percent of fully diluted ownership unless otherwise indicated.
[37] Investment is not unitized. Presentation is made in percent of fully diluted ownership unless otherwise indicated.
[38] The security has an effective contractual interest rate of 2.00% PIK + LIBOR+6.50%, Floor 1.00%, but the issuer may, in its discretion, elect to pay the PIK interest in cash. The rate presented represents the effective current yield based on actual payments received during the period.
[39] The security has an effective contractual interest rate of 2.00% PIK + LIBOR+6.50%, Floor 1.00%, but the issuer may, in its discretion, elect to pay the PIK interest in cash. The rate presented represents the effective current yield based on actual payments received during the period.
[40] As of September 30, 2022, borrowings under the loan facility bore interest at SOFR+6.25% (Floor 1.00%). Due to an amendment and subsequent funding during the quarter, the term loan facility has different floating rate reset dates. The rate presented represents a weighted-average rate for borrowings under the facility, as of September 30, 2022.
[41] Warrants are presented in equivalent units with a strike price of $1.50 per unit.
[42] The Company has entered into an intercreditor agreement that entitles the Company to the “last out” tranche of the first lien secured loans, whereby the “first out” tranche will receive priority as to the “last out” tranche with respect to payments of principal, interest, and any other amounts due thereunder. Therefore, the Company receives a higher interest rate than the contractual stated interest rate of LIBOR plus 7.96% (Floor 1.00%) per the credit agreement and the Consolidated Schedule of Investments above reflects such higher rate.
[43] Index based floating interest rate is subject to contractual maximum index rate of 1.50% as of September 30, 2022.
[44] Index based floating interest rate is subject to contractual maximum index rate of 1.50% as of December 31, 2021.
[45] Portfolio company headquarters are located outside of the United States.
[46] As of December 31, 2021, borrowings under the loan facility bore interest at LIBOR+6.00% or Prime+5.00%. Delayed draw term loan facility permits the borrower to make an interest rate election on each new tranche of borrowings under the facility. The rate presented represents a weighted-average rate for borrowings under the facility.
[47] As of September 30, 2022, borrowings under the loan facility bore interest at LIBOR+6.50% PIK or Prime+5.50% PIK. Revolving facility permits the borrower to make an interest rate election regarding the base rate on each draw under the facility. The rate presented represents a weighted-average rate for borrowings under the facility, as of September 30, 2022.
[48] Warrants are presented in equivalent shares/units with a strike price of $1.00 per share/unit.
[49] As of September 30, 2022, borrowings under the loan facility bore interest at SOFR+6.00% (Floor 1.00%) . Delayed draw term loan facility permits the borrower to make an interest rate election regarding the base rate on each draw under the facility. The rate presented represents a weighted-average rate for borrowings under the facility, as of September 30, 2022.
[50] External Investment Manager. Investment is not encumbered as security for the Company's Credit Facility or in support of the SBA-guaranteed debentures issued by the Funds.
[51] External Investment Manager. Investment is not encumbered as security for the Company's Credit Facility or in support of the SBA-guaranteed debentures issued by the Funds.
[52] Warrants are presented in equivalent units with a strike price of $14.28 per unit.
[53] Warrants are presented in equivalent units with a strike price of $14.28 per unit.
[54] Portfolio company is in a bankruptcy process and, as such, the maturity date of our debt investment in this portfolio company will not be finally determined until such process is complete. As noted in footnote (14), our debt investment in this portfolio company is on non-accrual status.
[55] Portfolio company is in a bankruptcy process and, as such, the maturity date of our debt investment in this portfolio company will not be finally determined until such process is complete. As noted in footnote (14), our debt investment in this portfolio company is on non-accrual status.
[56] In connection with the Company's debt investment in Staples Canada ULC and in an attempt to mitigate any potential adverse change in foreign exchange rates during the term of the Company’s investment, the Company maintains a forward foreign currency contract with Cadence Bank to lend $17.6 million Canadian Dollars and receive $13.6 million U.S. Dollars with a settlement date of September 14, 2023. The unrealized appreciation on the forward foreign currency contract was $0.8 million as of September 30, 2022.
[57] In connection with the Company's debt investment in Staples Canada ULC and in an attempt to mitigate any potential adverse change in foreign exchange rates during the term of the Company's investment, the Company maintains a forward foreign currency contract with Cadence Bank to lend $21.4 million Canadian Dollars and receive $16.9 million U.S. Dollars with a settlement date of September 14, 2022. The unrealized depreciation on the forward foreign currency contract was not significant as of December 31, 2021.
[58] Short-term portfolio investments. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of short-term portfolio investments.
[59] Short-term portfolio investments. See Note C—Fair Value Hierarchy for Investments—Portfolio Composition for a description of short-term portfolio investments.
[60] As of September 30, 2022, borrowings under the loan facility bore interest at SOFR+7.25% (Floor 1.00%). Each new draw on the delayed draw term loan facility has a different floating rate reset date. The rate presented represents a weighted-average rate for borrowings under the facility, as of September 30, 2022.