Statements of Changes in Net Assets (Unaudited) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Increase (decrease) in net assets from operations:
Net investment income	$ 14,496,949	$ 10,741,124	$ 41,435,416	$ 33,563,330
Realized gain (loss) on investments, including U.S. Treasury Bills	406,917	718,310	939,377	(4,076,766)
Net change in unrealized appreciation (depreciation) on investments	(3,182,093)	(1,228,382)	(28,617,263)	(3,172,841)
Net increase in net assets resulting from operations	11,721,773	10,231,052	13,757,530	26,313,723
Distributions to stockholders from:
Dividends paid to shareholders	(13,450,710)	(11,114,754)	(37,005,717)	(34,597,684)
Total distributions to stockholders	(13,450,710)	(11,114,754)	(37,005,717)	(34,597,684)
Capital share transactions
Issuance of common stock, value		18,976,917		19,283,828
Reinvestment of dividends, value		8,401,215		26,994,806
Acquisition of treasury shares, value	4,022,696		9,301,933
Offering costs		(32,542)	16,000	(37,373)
Net increase (decrease) in net assets resulting from capital share transactions	(4,022,696)	27,345,590	(9,285,933)	46,241,261
Total increase (decrease) in net assets	(5,751,633)	26,461,888	(32,534,120)	37,957,300
Net assets at beginning of period	579,412,004	477,739,097	606,194,491	466,243,685
Net assets at end of period	$ 573,660,371	$ 504,200,985	$ 573,660,371	$ 504,200,985
Capital share activity
Issuance of common stock, Shares		1,840,160		3,116,563
Treasury shares acquired	(331,264)		(744,756)
Shares outstanding at beginning of period	40,967,122	32,690,454	41,380,614	31,414,051
Shares outstanding at end of period	40,635,858	34,530,614	40,635,858	34,530,614
Non Control / Non Affiliate Investments Including Treasury Bills
Increase (decrease) in net assets from operations:
Realized gain (loss) on investments, including U.S. Treasury Bills	$ 406,917	$ 718,310	$ 939,442	$ (4,076,766)
Net change in unrealized appreciation (depreciation) on investments	(1,956,044)	(6,857,594)	(14,275,206)	(10,979,143)
Affiliate Investments
Increase (decrease) in net assets from operations:
Net change in unrealized appreciation (depreciation) on investments	(171,789)		(3,380,221)
Control Investments
Increase (decrease) in net assets from operations:
Realized gain (loss) on control investments			(65)
Net change in unrealized appreciation (depreciation) on investments	$ (1,054,260)	$ 5,629,212	$ (10,961,836)	$ 7,806,302