CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS - USD ($)	3 Months Ended						9 Months Ended		12 Months Ended		124 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2022
Investment Company, Changes in Net Assets [Line Items]
Beginning balance	$ 279,866,118	$ 285,036,401	$ 285,111,233	$ 274,166,281	$ 273,428,885	$ 273,360,649	$ 285,111,233	$ 273,360,649	$ 273,360,649
Beginning balance (shares)			19,517,595				19,517,595
Net investment income	7,189,320	6,174,571	$ 5,514,183	4,064,100	5,535,015	5,060,631
Net realized gain (loss) on non-controlled, non-affiliated investments	1,553,450	(352,723)	3,458,090	7,921,322	(1,781,665)	462,228	$ 4,658,817	6,601,885
Loss on debt extinguishment						(539,250)		(539,250)
Net realized loss on foreign currency transaction	(676)		(7,350)
Net change in unrealized appreciation (depreciation) on non-controlled, non-affiliated investments	(4,798,980)	(4,289,591)	(3,721,602)	2,080,603	1,665,877	121,983
Net change in unrealized depreciation on foreign currency translations	(18,120)	(35,754)
Provision (benefits) for taxes on unrealized appreciation (depreciation) on investments	30,535	(160,656)	(21,157)	(606,377)	187,721	(167,804)
Provision for taxes on realized gain on investments				(681,027)
Distributions from net investment income	(6,643,663)	(6,643,663)	(5,464,666)	(11,299,933)	(4,869,552)	(4,869,552)
Issuance of common stock, net of offering costs		$ 137,533	$ 167,670
Issuance of common stock, net of offering costs (shares)		13,416	14,924				19,545,935		31,592	354,257	19,545,935
Ending balance	$ 277,177,984	$ 279,866,118	$ 285,036,401	275,644,969	274,166,281	273,428,885	$ 277,177,984	275,644,969	$ 285,111,233	$ 273,360,649	$ 277,177,984
Ending balance (shares)	19,545,935						19,545,935		19,517,595		19,545,935
Common Stock
Investment Company, Changes in Net Assets [Line Items]
Beginning balance	$ 19,546	$ 19,533	$ 19,518	$ 19,486	$ 19,486	$ 19,486	$ 19,518	$ 19,486	$ 19,486
Beginning balance (shares)	19,545,935	19,532,519	19,517,595	19,486,003	19,486,003	19,486,003	19,517,595	19,486,003	19,486,003
Issuance of common stock, net of offering costs		$ 13	$ 15
Issuance of common stock, net of offering costs (shares)		13,416	14,924
Ending balance	$ 19,546	$ 19,546	$ 19,533	$ 19,486	$ 19,486	$ 19,486	$ 19,546	$ 19,486	$ 19,518	$ 19,486	$ 19,546
Ending balance (shares)	19,545,935	19,545,935	19,532,519	19,486,003	19,486,003	19,486,003	19,545,935	19,486,003	19,517,595	19,486,003	19,545,935
Paid-in capital
Investment Company, Changes in Net Assets [Line Items]
Beginning balance	$ 274,864,296	$ 274,726,776	$ 274,559,121	$ 276,026,667	$ 276,026,667	$ 276,026,667	$ 274,559,121	$ 276,026,667	$ 276,026,667
Issuance of common stock, net of offering costs		137,520	167,655
Ending balance	274,864,296	274,864,296	274,726,776	276,026,667	276,026,667	276,026,667	274,864,296	276,026,667	274,559,121	$ 276,026,667	$ 274,864,296
Accumulated undistributed surplus (deficit)
Investment Company, Changes in Net Assets [Line Items]
Beginning balance	4,982,276	10,290,092	10,532,594	(1,879,872)	(2,617,268)	(2,685,504)	10,532,594	(2,685,504)	(2,685,504)
Net investment income	7,189,320	6,174,571	5,514,183	4,064,100	5,535,015	5,060,631
Net realized gain (loss) on non-controlled, non-affiliated investments	1,553,450	(352,723)	3,458,090	7,921,322	(1,781,665)	462,228
Loss on debt extinguishment						(539,250)
Net realized loss on foreign currency transaction	(676)		(7,350)
Net change in unrealized appreciation (depreciation) on non-controlled, non-affiliated investments	(4,798,980)	(4,289,591)	(3,721,602)	2,080,603	1,665,877	121,983
Net change in unrealized depreciation on foreign currency translations	(18,120)	(35,754)
Provision (benefits) for taxes on unrealized appreciation (depreciation) on investments	30,535	(160,656)	(21,157)	(606,377)	187,721	(167,804)
Provision for taxes on realized gain on investments				(681,027)
Distributions from net investment income	(6,643,663)	(6,643,663)	(5,464,666)	(11,299,933)	(4,869,552)	(4,869,552)
Ending balance	$ 2,294,142	$ 4,982,276	$ 10,290,092	$ (401,184)	$ (1,879,872)	$ (2,617,268)	$ 2,294,142	$ (401,184)	$ 10,532,594	$ (2,685,504)	$ 2,294,142