Quarterly report [Sections 13 or 15(d)]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 6 Months Ended
Jun. 30, 2026
Accounting Policies [Abstract]  
Schedule of Investment Income
A summarized presentation of total investment income Main Street earned from its Investment Portfolio in each of the periods presented is as follows:
Three Months Ended
June 30,
Six Months Ended
June 30,
2026
2025
2026
2025
(in thousands)
Interest, dividend and fee income:
Interest income $ 112,633  $ 100,857  $ 217,939  $ 198,874 
Dividend income 27,398  37,845  55,594  73,871 
Fee income 9,541  5,271  16,145  8,274 
Total investment income $ 149,572  $ 143,973  $ 289,678  $ 281,019