Consolidated Schedules of Investments (Affiliate Security) - USD ($)		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Schedule Of Investments [Line Items]
Fair Value, Beginning Balance		$ 552,563,994
Net realized gain (loss)		1,196,573		$ (19,077,032)		$ (115,988,233)
Fair Value, Ending Balance		570,489,084		552,563,994
Non-Controlled Affiliate Security
Schedule Of Investments [Line Items]
Dividends and interest income		456,686	[1],[2]	565,167	[3],[4]
Fair Value, Beginning Balance		4,131,978	[2]	13,099,313	[4]
Net realized gain (loss)		0	[1],[2]	(7,989,591)	[4]
Net increase or decrease in unrealized appreciation or depreciation		620,438	[1],[2]	6,932,957	[4]
Acquisitions		347,444	[2],[5]	4,055,495	[4],[6]
Dispositions		(1,525,422)	[2],[7]	(11,966,196)	[4],[8]
Fair Value, Ending Balance		3,574,438	[2]	4,131,978	[2]	13,099,313	[4]
Non-Controlled Affiliate Security | AGY Equity, LLC | Class A Preferred Stock
Schedule Of Investments [Line Items]
Dividends and interest income		0	[1],[2]	0	[3],[4]
Fair Value, Beginning Balance		251,736	[2]	1,557,200	[4]
Net realized gain (loss)		0	[2],[9]	0	[4]
Net increase or decrease in unrealized appreciation or depreciation		(251,736)	[1],[2]	(1,305,464)	[4]
Acquisitions		0	[2],[5]	0	[4],[6]
Dispositions		0	[2],[7]	0	[4],[8]
Fair Value, Ending Balance		0	[2]	251,736	[2]	1,557,200	[4]
Non-Controlled Affiliate Security | AGY Equity, LLC | Class B Preferred Stock
Schedule Of Investments [Line Items]
Dividends and interest income		0	[1],[2]	0	[3],[4]
Fair Value, Beginning Balance		0	[2]	0	[4]
Net realized gain (loss)		0	[2],[9]	0	[4]
Net increase or decrease in unrealized appreciation or depreciation		0	[1],[2]	0	[4]
Acquisitions		0	[2],[5]	0	[4],[6]
Dispositions		0	[2],[7]	0	[4],[8]
Fair Value, Ending Balance		0	[2]	0	[2]	0	[4]
Non-Controlled Affiliate Security | AGY Equity, LLC | Class C Common Stock
Schedule Of Investments [Line Items]
Dividends and interest income		0	[1],[2]	0	[3],[4]
Fair Value, Beginning Balance		0	[2]	0	[4]
Net realized gain (loss)		0	[2],[9]	0	[4]
Net increase or decrease in unrealized appreciation or depreciation		0	[1],[2]	0	[4]
Acquisitions		0	[2],[5]	0	[4],[6]
Dispositions		0	[2],[7]	0	[4],[8]
Fair Value, Ending Balance		0	[2]	0	[2]	0	[4]
Non-Controlled Affiliate Security | Kemmerer Operations, LLC (WMLP) | Delayed Draw Term Loan, First Lien
Schedule Of Investments [Line Items]
Dividends and interest income		1,170	[1],[2]	51,627	[3],[4]
Fair Value, Beginning Balance		42,550	[2]	284,343	[4]
Net realized gain (loss)		0	[2],[9]	0	[4]
Net increase or decrease in unrealized appreciation or depreciation		0	[1],[2]	214,865	[4]
Acquisitions		1,188	[2],[5]	51,818	[4],[6]
Dispositions		(43,738)	[2],[7]	(508,476)	[4],[8]
Fair Value, Ending Balance				42,550	[2]	284,343	[4]
Non-Controlled Affiliate Security | Kemmerer Operations, LLC (WMLP) | Senior Secured Loan, First Lien
Schedule Of Investments [Line Items]
Dividends and interest income		455,516	[1],[2]	428,855	[3],[4]
Fair Value, Beginning Balance		3,091,618	[2]	2,314,096	[4]
Net realized gain (loss)		0	[2],[9]	0	[4]
Net increase or decrease in unrealized appreciation or depreciation		0	[1],[2]	348,845	[4]
Acquisitions		346,256	[2],[5]	428,677	[4],[6]
Dispositions		(1,481,684)	[2],[7]	0	[4],[8]
Fair Value, Ending Balance		1,956,190	[2]	3,091,618	[2]	2,314,096	[4]
Non-Controlled Affiliate Security | Kemmerer Operations, LLC (WMLP) | Limited Liability Co. Interest
Schedule Of Investments [Line Items]
Dispositions	[2],[7]	0
Non-Controlled Affiliate Security | Kemmerer Holdings, LLC (WMLP) | Delayed Draw Term Loan, First Lien
Schedule Of Investments [Line Items]
Fair Value, Ending Balance	[2]	0
Non-Controlled Affiliate Security | Kemmerer Holdings, LLC (WMLP) | Limited Liability Co. Interest
Schedule Of Investments [Line Items]
Dividends and interest income		0	[1],[2]	0	[3],[4]
Fair Value, Beginning Balance		746,074	[2]	0	[4]
Net realized gain (loss)		0	[2],[9]	0	[4]
Net increase or decrease in unrealized appreciation or depreciation		872,174	[1],[2]	746,074	[4]
Acquisitions		0	[2],[5]	0	[4],[10]
Dispositions	[4],[8]			0
Fair Value, Ending Balance		1,618,248	[2]	746,074	[2]	0	[4]
Non-Controlled Affiliate Security | Advanced Lighting Technologies, LLC | Warrants
Schedule Of Investments [Line Items]
Dividends and interest income	[4]			0
Fair Value, Beginning Balance	[4]	0		0
Net realized gain (loss)	[4]			0
Net increase or decrease in unrealized appreciation or depreciation	[4]			0
Acquisitions	[4],[6]			0
Dispositions	[4],[8]			0
Fair Value, Ending Balance	[4]			0		0
Non-Controlled Affiliate Security | Advanced Lighting Technologies, LLC | Senior Secured Note, Second Lien
Schedule Of Investments [Line Items]
Dividends and interest income	[4]			0
Fair Value, Beginning Balance	[4]	0		0
Net realized gain (loss)	[4]			(1,999,678)
Net increase or decrease in unrealized appreciation or depreciation	[4]			2,181,306
Acquisitions	[4],[6]			0
Dispositions	[4],[8]			(181,628)
Fair Value, Ending Balance	[4]			0		0
Non-Controlled Affiliate Security | Advanced Lighting Technologies, LLC | Senior Secured Loan, First Lien
Schedule Of Investments [Line Items]
Dividends and interest income	[3],[4]			13,185
Fair Value, Beginning Balance	[4]	0		3,223,664
Net realized gain (loss)	[4]			(3,017,339)
Net increase or decrease in unrealized appreciation or depreciation	[4]			1,774,757
Acquisitions	[4],[6]			0
Dispositions	[4],[8]			(1,981,082)
Fair Value, Ending Balance	[4]			0		3,223,664
Non-Controlled Affiliate Security | Advanced Lighting Technologies, LLC | Limited Liability Co. Interest
Schedule Of Investments [Line Items]
Dividends and interest income	[4]			0
Fair Value, Beginning Balance	[4]	0		0
Net realized gain (loss)	[4]			0
Net increase or decrease in unrealized appreciation or depreciation	[4]			0
Acquisitions	[4],[6]			0
Dispositions	[4],[8]			0
Fair Value, Ending Balance	[4]			0		0
Non-Controlled Affiliate Security | Advantage Insurance Inc | Preferred Stock
Schedule Of Investments [Line Items]
Dividends and interest income	[3],[4]			0
Fair Value, Beginning Balance	[4]	0		5,720,010
Net realized gain (loss)	[4]			(2,972,574)
Net increase or decrease in unrealized appreciation or depreciation	[4]			2,972,574
Acquisitions	[4],[6]			0
Dispositions	[4],[8]			(5,720,010)
Fair Value, Ending Balance	[4]			0		5,720,010
Non-Controlled Affiliate Security | Advantage Insurance Inc | Preferred Stock Series B
Schedule Of Investments [Line Items]
Dividends and interest income	[3],[4]			71,500
Fair Value, Beginning Balance	[4]	0		0
Net realized gain (loss)	[4]			0
Net increase or decrease in unrealized appreciation or depreciation	[4]			0
Acquisitions	[4],[6]			3,575,000
Dispositions	[4],[8]			(3,575,000)
Fair Value, Ending Balance	[4]			0		0
Controlled Affiliate Security
Schedule Of Investments [Line Items]
Dividends and interest income		0	[1],[11]	2,366,232	[10],[12]
Fair Value, Beginning Balance	[10]	21,927,071	[11]	110,968,227
Net realized gain (loss)		0	[1],[11]	(32,496,018)	[10]
Net increase or decrease in unrealized appreciation or depreciation		(2,523,687)	[9],[11]	38,629,306	[10],[13]
Acquisitions		0	[11],[14]	0	[10],[15]
Dispositions		(4,175,384)	[11],[16]	(95,174,444)	[10],[17]
Fair Value, Ending Balance		15,228,000	[11]	21,927,071	[10],[11]	110,968,227	[10]
Controlled Affiliate Security | Gordon Brothers Finance Company | Unsecured Debt
Schedule Of Investments [Line Items]
Dividends and interest income		0	[1],[11]	0	[10],[12]
Fair Value, Beginning Balance	[10]	21,927,071	[11]	22,850,000
Net realized gain (loss)		0	[9],[11]	0	[10]
Net increase or decrease in unrealized appreciation or depreciation		(2,523,687)	[9],[11]	504,323	[10],[13]
Acquisitions		0	[11],[14]	0	[10],[15]
Dispositions		(4,175,384)	[11],[16]	(1,427,252)	[10],[17]
Fair Value, Ending Balance		15,228,000	[11]	21,927,071	[10],[11]	22,850,000	[10]
Controlled Affiliate Security | Gordon Brothers Finance Company | Preferred Stock
Schedule Of Investments [Line Items]
Dividends and interest income		0	[1],[11]	0	[10],[12]
Fair Value, Beginning Balance	[10]	0	[11]	0
Net realized gain (loss)		0	[9],[11]	0	[10]
Net increase or decrease in unrealized appreciation or depreciation		0	[9],[11]	0	[10],[13]
Acquisitions		0	[11],[14]	0	[10],[15]
Dispositions		0	[11],[16]	0	[10],[17]
Fair Value, Ending Balance		0	[11]	0	[10],[11]	0	[10]
Controlled Affiliate Security | Gordon Brothers Finance Company | Common Stock
Schedule Of Investments [Line Items]
Dividends and interest income	[1],[11]	0
Fair Value, Beginning Balance	[10]	0	[11]	0
Net realized gain (loss)		0	[9],[11]	0	[10]
Net increase or decrease in unrealized appreciation or depreciation		0	[9],[11]	0	[10],[13]
Acquisitions		0	[11],[14]	0	[10],[15]
Dispositions		0	[11],[16]	0	[10],[17]
Fair Value, Ending Balance		0	[11]	0	[10],[11]	0	[10]
Controlled Affiliate Security | BCIC Senior Loan Partners, LLC: | Limited Liability Co. Interest
Schedule Of Investments [Line Items]
Dividends and interest income	[10],[12]			1,647,661
Fair Value, Beginning Balance	[10]	0		36,150,259
Net realized gain (loss)	[10]			(21,980,389)
Net increase or decrease in unrealized appreciation or depreciation	[10],[13]			25,758,053
Acquisitions	[10],[15]			0
Dispositions	[10],[17]			(39,927,923)
Fair Value, Ending Balance	[10]			0		36,150,259
Controlled Affiliate Security | First Boston Construction Holdings L L C | Subordinated Debt
Schedule Of Investments [Line Items]
Dividends and interest income	[10],[12]			163,125
Fair Value, Beginning Balance	[10]	0		32,625,000
Net realized gain (loss)	[10]			0
Net increase or decrease in unrealized appreciation or depreciation	[10],[13]			0
Acquisitions	[10],[15]			0
Dispositions	[10],[17]			(32,625,000)
Fair Value, Ending Balance	[10]			0		32,625,000
Controlled Affiliate Security | First Boston Construction Holdings L L C | Limited Liability Co. Interest
Schedule Of Investments [Line Items]
Dividends and interest income	[10],[12]			0
Fair Value, Beginning Balance	[10]	0		4,557,035
Net realized gain (loss)	[10]			(2,290,144)
Net increase or decrease in unrealized appreciation or depreciation	[10],[13]			3,599,215
Acquisitions	[10],[15]			0
Dispositions	[10],[17]			(5,866,106)
Fair Value, Ending Balance	[10]			0		4,557,035
Controlled Affiliate Security | Red Apple Stores Inc | Unsecured Debt
Schedule Of Investments [Line Items]
Acquisitions	[10],[15]			0
Controlled Affiliate Security | Red Apple Stores Inc | Preferred Stock
Schedule Of Investments [Line Items]
Dividends and interest income	[10],[12]			0
Fair Value, Beginning Balance	[10]	0		0
Net realized gain (loss)	[10]			0
Net increase or decrease in unrealized appreciation or depreciation	[10],[13]			0
Acquisitions	[10],[15]			0
Dispositions	[10],[17]			0
Fair Value, Ending Balance	[10]			0		0
Controlled Affiliate Security | Red Apple Stores Inc | Common Stock
Schedule Of Investments [Line Items]
Dividends and interest income	[10],[12]			0
Fair Value, Beginning Balance	[10]	0		0
Net realized gain (loss)	[10]			(6,751,452)
Net increase or decrease in unrealized appreciation or depreciation	[10],[13]			6,751,452
Acquisitions	[10],[15]			0
Dispositions	[10],[17]			0
Fair Value, Ending Balance	[10]			0		0
Controlled Affiliate Security | Red Apple Stores Inc | Senior Secured Note, Second Lien
Schedule Of Investments [Line Items]
Fair Value, Beginning Balance	[10]	$ 0
Fair Value, Ending Balance	[10]			0
Controlled Affiliate Security | Red Apple Stores Inc | Senior Secured Loan Second Lien
Schedule Of Investments [Line Items]
Dividends and interest income	[10],[12]			555,446
Fair Value, Beginning Balance	[10]			14,785,933
Net realized gain (loss)	[10]			(1,474,033)
Net increase or decrease in unrealized appreciation or depreciation	[10],[13]			2,016,263
Dispositions	[10],[17]			$ (15,328,163)
Fair Value, Ending Balance	[10]					$ 14,785,933

[1] Amounts reported above are for the year ended December 31, 2022. Dividends and interest income also includes fee income as applicable.

[2] The issuers of the securities listed on this schedule are considered non-controlled, affiliated investments under the 1940 Act due to the ownership by the Company of 5% to 25% of the issuers’ voting securities.

[3] Also includes fee income as applicable.

[4] The issuers of the securities listed on this schedule are considered non-controlled, affiliated investments under the 1940 Act due to the ownership by the Company of 5% to 25% of the issuers’ voting securities.

[5] Acquisitions include new purchases, PIK income and amortization of original issue and market discounts, and the movement of an existing portfolio company into this category from a different category for the year ended December 31, 2022.

[6] Acquisitions include new purchases, PIK income and amortization of original issue and market discounts, and the movement of an existing portfolio company into this category from a different category.

[7] Dispositions include decreases in the cost basis of investments, net of realized gain or loss, resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category for the year ended December 31, 2022.

[8] Dispositions include decreases in the cost basis of investments, net of realized gain or loss, resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category.

[9] Amounts reported above are for the year ended December 31, 2022. Dividends and interest income also includes fee income as applicable.

[10] The issuers of the securities listed on this schedule are considered controlled affiliates under the 1940 Act due to the ownership by the Company of more than 25% of the issuers’ voting securities.

[11] The issuers of securities listed on this schedule are considered controlled affiliates under the 1940 Act due to the ownership by the Company of more than 25% of the issuers’ voting securities.

[12] Also includes fee income as applicable.

[13] Net unrealized gain (loss) before taxes includes the net change in unrealized appreciation (depreciation) on controlled investments and net change in unrealized appreciation (depreciation) on foreign currency translation associated with the controlled investments. For the year ended December 31, 2021, the net change in unrealized appreciation (depreciation) and foreign currency translation associated with the Red Apple Stores Inc.’s common stock was $285,360 and $(285,360), respectively.†

[14] Acquisitions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category for the year ended December 31, 2022.

[15] Acquisitions include increases in the cost basis of investments resulting from new portfolio investments, PIK interest or dividends, the amortization of unearned income, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company into this category from a different category.

[16] Dispositions include decreases in the cost basis of investments, net of realized gain or loss, resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category for the year ended December 31, 2022.

[17] Dispositions include decreases in the cost basis of investments, net of realized gain or loss, resulting from principal collections related to investment repayments or sales, the exchange of one or more existing securities for one or more new securities and the movement of an existing portfolio company out of this category into a different category.