Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
INVESTMENT INCOME:
Total investment income	$ 53,178	$ 58,099
EXPENSES:
Management fees (see note 3)	7,513	7,882
Performance-based incentive fees (see note 3)	5,526	5,952
Interest and other credit facility expenses (see note 7)	15,840	18,188
Administrative services expense (see note 3)	1,361	1,376
Other general and administrative expenses	835	895
Total expenses	31,075	34,293
Performance-based incentive fees waived (see note 3)	(2)	(46)
Net expenses	31,073	34,247
Net investment income	22,105	23,852
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS AND CASH EQUIVALENTS:
Net realized loss on investments and cash equivalents (companies less than 5% owned)	(422)	135
Net change in unrealized gain (loss) on investments and cash equivalents:
Unrealized Gain (Loss) on Investments	(1,757)	3,884
Net realized and unrealized gain (loss) on investments and cash equivalents	(2,179)	4,019
Net increase in net assets resulting from operations	$ 19,926	$ 27,871
EARNINGS PER SHARE (see note 5), Basic	$ 0.37	$ 0.51
EARNINGS PER SHARE (see note 5), Diluted	$ 0.37	$ 0.51
Companies less than 5% owned [Member]
INVESTMENT INCOME:
Interest	$ 29,174	$ 41,004
Other income	874	574
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS AND CASH EQUIVALENTS:
Net realized loss on investments and cash equivalents (companies less than 5% owned)	(422)	135
Net change in unrealized gain (loss) on investments and cash equivalents:
Unrealized Gain (Loss) on Investments	(2,780)	3,484
Companies 5% to 25% owned [Member]
INVESTMENT INCOME:
Interest	1,224	831
Dividends	770	0
Net change in unrealized gain (loss) on investments and cash equivalents:
Unrealized Gain (Loss) on Investments	(2,027)	1
Companies more than 25% owned [Member]
INVESTMENT INCOME:
Interest	17,796	12,227
Dividends	3,050	399
Other income	105	125
Net change in unrealized gain (loss) on investments and cash equivalents:
Unrealized Gain (Loss) on Investments	$ 3,235	$ 3,338