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Investments - SLF, Net Increase (Decrease) in Members' Capital (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Investment income:    
Interest income $ 11,662 $ 12,524
Total investment income 15,182 16,804
Expenses:    
Interest and other debt financing expenses 5,507 5,514
Professional fees and other expenses 268 128
Net investment income 5,470 6,627
Net gain (loss):    
Net change in unrealized gain (loss) (2,279) (4,008)
Net gain (loss) (2,275) (3,268)
Net increase (decrease) in net assets resulting from operations 3,195 3,359
MRCC Senior Loan Fund I, LLC    
Investment income:    
Interest income 4,038 5,143
Total investment income 4,038 5,143
Expenses:    
Interest and other debt financing expenses 1,690 2,352
Professional fees and other expenses 227 206
Total expenses 1,917 2,558
Net investment income 2,121 2,585
Net gain (loss):    
Net realized gain (loss) 36 (540)
Net change in unrealized gain (loss) (618) 264
Net gain (loss) (582) (276)
Net increase (decrease) in net assets resulting from operations $ 1,539 $ 2,309