CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS - USD ($)	12 Months Ended				139 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2023
Investment Company, Changes in Net Assets
Beginning balance	$ 275,776,613	$ 285,111,233	$ 273,360,649
Beginning balance (shares)	19,666,769
Net investment income	$ 42,210,577	28,586,684	19,776,467
Net realized gain on investments	(30,211,467)	3,660,595	23,710,167
Loss on debt extinguishment			(539,250)
Net realized loss on foreign currency translation	(112,481)	(6,091)
Net change in unrealized depreciation on control investments	2,792,152	(17,542,230)	(6,928,160)
Net change in unrealized appreciation on foreign currency translations	(6,504)	6,040
Provision (benefits) for taxes on unrealized appreciation (depreciation) on investments	(126,957)	(213,214)	510,868
Provision for taxes on realized gain on investments			(2,957,220)
Benefit for taxes on realized loss on investments	2,987,847
Distributions from net investment income	(35,080,734)	(21,633,343)	(21,201,567)
Distributions from net realized capital gains	(446,746)	(3,789,693)	(1,014,420)
Issuance of common stock, net of offering costs	$ 62,157,488	$ 1,596,632	$ 393,699
Issuance of common stock, net of offering costs (shares)	4,458,873	149,174	31,592	354,257	24,125,642
Ending balance	$ 319,939,788	$ 275,776,613	$ 285,111,233	$ 273,360,649	$ 319,939,788
Ending balance (shares)	24,125,642	19,666,769			24,125,642
Common Stock
Investment Company, Changes in Net Assets
Beginning balance	$ 19,667	$ 19,518	$ 19,486
Beginning balance (shares)	19,666,769	19,517,595	19,486,003
Issuance of common stock, net of offering costs	$ 4,458	$ 149	$ 32
Issuance of common stock, net of offering costs (shares)	4,458,873	149,174	31,592
Ending balance	$ 24,125	$ 19,667	$ 19,518	$ 19,486	$ 24,125
Ending balance (shares)	24,125,642	19,666,769	19,517,595	19,486,003	24,125,642
Paid-in capital
Investment Company, Changes in Net Assets
Beginning balance	$ 275,114,720	$ 274,559,121	$ 276,026,667
Return of capital and other tax related adjustments	(1,348,766)	(1,040,884)	(1,861,213)
Issuance of common stock, net of offering costs	62,153,030	1,596,483	393,667
Ending balance	335,918,984	275,114,720	274,559,121	$ 276,026,667	$ 335,918,984
Accumulated undistributed surplus (deficit)
Investment Company, Changes in Net Assets
Beginning balance	642,226	10,532,594	(2,685,504)
Net investment income	42,210,577	28,586,684	19,776,467
Net realized gain on investments	(30,211,467)	3,660,595	23,710,167
Loss on debt extinguishment			(539,250)
Net realized loss on foreign currency translation	(112,481)	(6,091)
Net change in unrealized depreciation on control investments	2,792,152	(17,542,230)	(6,928,160)
Net change in unrealized appreciation on foreign currency translations	(6,504)	6,040
Provision (benefits) for taxes on unrealized appreciation (depreciation) on investments	(126,957)	(213,214)	510,868
Provision for taxes on realized gain on investments			(2,957,220)
Return of capital and other tax related adjustments	1,348,766	1,040,884	1,861,213
Benefit for taxes on realized loss on investments	2,987,847
Distributions from net investment income	(35,080,734)	(21,633,343)	(21,201,567)
Distributions from net realized capital gains	(446,746)	(3,789,693)	(1,014,420)
Ending balance	$ (16,003,321)	$ 642,226	$ 10,532,594	$ (2,685,504)	$ (16,003,321)