CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS - USD ($)	12 Months Ended				127 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2022
Investment Company, Changes in Net Assets [Line Items]
Beginning balance	$ 285,111,233	$ 273,360,649	$ 270,571,173
Beginning balance (shares)	19,517,595
Net investment income	$ 28,586,684	19,776,467	21,991,903
Net realized gain (loss) on non-controlled, non-affiliated investments	3,660,595	23,710,167	(10,129,859)
Loss on debt extinguishment		(539,250)
Net realized loss on foreign currency transaction	(6,091)
Net change in unrealized appreciation (depreciation) on non-controlled, non-affiliated investments	(17,542,230)	(6,928,160)	8,555,274
Net change in unrealized depreciation on foreign currency translations	6,040
Provision (benefits) for taxes on unrealized appreciation (depreciation) on investments	(213,214)	510,868	(224,877)
Provision for taxes on realized gain on investments		(2,957,220)
Distributions from net investment income	(21,633,343)	(21,201,567)	(22,402,959)
Distributions from net realized capital gains	(3,789,693)	(1,014,420)
Issuance of common stock, net of offering costs	$ 1,596,632	$ 393,699	$ 4,999,994
Issuance of common stock, net of offering costs (shares)	149,174	31,592	354,257	3,177,936	19,666,769
Ending balance	$ 275,776,613	$ 285,111,233	$ 273,360,649	$ 270,571,173	$ 275,776,613
Ending balance (shares)	19,666,769	19,517,595			19,666,769
Common Stock
Investment Company, Changes in Net Assets [Line Items]
Beginning balance	$ 19,518	$ 19,486	$ 19,132
Beginning balance (shares)	19,517,595	19,486,003	19,131,746
Issuance of common stock, net of offering costs	$ 149	$ 32	$ 354
Issuance of common stock, net of offering costs (shares)	149,174	31,592	354,257
Ending balance	$ 19,667	$ 19,518	$ 19,486	$ 19,132	$ 19,667
Ending balance (shares)	19,666,769	19,517,595	19,486,003	19,131,746	19,666,769
Paid-in capital
Investment Company, Changes in Net Assets [Line Items]
Beginning balance	$ 274,559,121	$ 276,026,667	$ 272,117,091
Return of capital and other tax related adjustments	(1,040,884)	(1,861,213)	(1,090,064)
Issuance of common stock, net of offering costs	1,596,483	393,667	4,999,640
Ending balance	275,114,720	274,559,121	276,026,667	$ 272,117,091	$ 275,114,720
Accumulated undistributed surplus (deficit)
Investment Company, Changes in Net Assets [Line Items]
Beginning balance	10,532,594	(2,685,504)	(1,565,050)
Net investment income	28,586,684	19,776,467	21,991,903
Net realized gain (loss) on non-controlled, non-affiliated investments	3,660,595	23,710,167	(10,129,859)
Loss on debt extinguishment		(539,250)
Net realized loss on foreign currency transaction	(6,091)
Net change in unrealized appreciation (depreciation) on non-controlled, non-affiliated investments	(17,542,230)	(6,928,160)	8,555,274
Net change in unrealized depreciation on foreign currency translations	6,040
Provision (benefits) for taxes on unrealized appreciation (depreciation) on investments	(213,214)	510,868	(224,877)
Provision for taxes on realized gain on investments		(2,957,220)
Return of capital and other tax related adjustments	1,040,884	1,861,213	1,090,064
Distributions from net investment income	(21,633,343)	(21,201,567)	(22,402,959)
Distributions from net realized capital gains	(3,789,693)	(1,014,420)
Ending balance	$ 642,226	$ 10,532,594	$ (2,685,504)	$ (1,565,050)	$ 642,226