Consolidated Statements of Operations - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Investment income
Total investment income	$ 181,002,459	$ 165,105,708	$ 172,103,726
Operating expenses
Interest and other debt expenses	39,358,896	40,988,760	41,237,035
Management fees	26,259,584	25,719,938	23,806,418
Incentive fees	18,759,613	17,726,879	15,314,201
Professional fees	1,767,652	1,715,244	1,841,097
Administrative expenses	1,760,905	1,851,420	2,159,788
Director fees	1,090,654	982,111	857,789
Insurance expense	638,006	615,901	700,321
Custody fees	339,886	325,239	413,533
Other operating expenses	2,589,090	2,637,102	2,551,562
Total operating expenses	92,564,286	92,562,594	88,881,744
Net investment income	88,438,173	72,543,114	83,221,982
Net realized gain (loss):
Net realized gain (loss)	(18,230,951)	4,287,643	(5,512,830)
Net change in unrealized appreciation (depreciation):
Net change in unrealized appreciation (depreciation)	(79,432,554)	63,166,306	(3,897,751)
Net realized and unrealized gain (loss)	(97,663,505)	67,453,949	(9,410,581)
Realized loss on extinguishment of debt	0	(6,206,289)	(2,436,913)
Net increase (decrease) in net assets resulting from operations	$ (9,225,332)	$ 133,790,774	$ 71,374,488
Basic earnings (loss) per share	$ (0.16)	$ 2.32	$ 1.23
Diluted earnings (loss) per share	$ (0.16)	$ 2.32	$ 1.23
Basic weighted average common shares outstanding	57,767,264	57,767,264	57,991,233
Diluted weighted average common shares outstanding	57,767,264	57,767,264	57,991,233
Non-Controlled, Non-Affiliated Investments
Investment income
Interest income (excluding PIK)	$ 157,012,042	$ 143,005,804	$ 141,433,940
PIK income	7,899,134	5,839,520	7,554,503
Dividend income	1,017,828	1,131,568	0
Other income	881,611	449,021	4,660,979
Net realized gain (loss):
Net realized gain (loss)	(29,278,589)	(2,257,955)	618,133
Net change in unrealized appreciation (depreciation):
Net change in unrealized appreciation (depreciation)	(72,517,792)	13,083,276	(2,983,907)
Non-Controlled, Affiliated Investments
Investment income
Interest income (excluding PIK)	148,805	127,247	2,533,862
PIK income	0	0	3,757,086
Dividend income	2,357,066	4,599,288	0
Other income	180,520	1,163,495	3,272,529
Net realized gain (loss):
Net realized gain (loss)	11,172,439	6,545,598	(6,260,913)
Net change in unrealized appreciation (depreciation):
Net change in unrealized appreciation (depreciation)	(27,307,855)	53,937,566	44,680
Controlled Investments
Investment income
Interest income (excluding PIK)	7,710,565	6,678,789	6,378,826
Dividend income	3,794,889	2,110,976	2,473,865
Lease income			38,136
Net realized gain (loss):
Net realized gain (loss)	(124,801)	0	129,950
Net change in unrealized appreciation (depreciation):
Net change in unrealized appreciation (depreciation)	$ 20,393,093	$ (3,854,536)	$ (958,524)