Investments - SLF, Net Increase (Decrease) in Members' Capital (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Investment income:
Interest income	$ 11,303	$ 12,804	$ 34,815	$ 37,553
Total investment income	15,695	15,643	46,504	48,794
Expenses:
Interest and other debt financing expenses	5,517	5,874	16,804	17,178
Professional fees and other expenses	239	189	706	541
Net investment income	6,481	5,420	18,510	17,971
Net gain (loss):
Net change in unrealized gain (loss)	(2,153)	(5,682)	(8,239)	18,249
Net gain (loss)	(1,515)	(5,656)	(7,091)	(19,184)
Net increase (decrease) in net assets resulting from operations	4,966	(236)	11,419	(1,213)
MRCC Senior Loan Fund I, LLC
Investment income:
Interest income	2,975	3,936	10,345	14,017
Total investment income	2,975	3,936	10,345	14,017
Expenses:
Interest and other debt financing expenses	1,159	2,194	4,204	6,848
Professional fees and other expenses	120	146	477	549
Total expenses	1,279	2,340	4,681	7,397
Net investment income	1,696	1,596	5,664	6,620
Net gain (loss):
Net realized gain (loss)	0	(274)	82	(814)
Net change in unrealized gain (loss)	(298)	(2,073)	(794)	(4,886)
Net gain (loss)	(298)	(2,347)	(712)	(5,700)
Net increase (decrease) in net assets resulting from operations	$ 1,398	$ (751)	$ 4,952	$ 920