Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flows from Operating Activities
Net change in net assets resulting from operations	$ (38,124,247)	$ 5,066,822	$ (132,177,053)
Adjustments to reconcile net change in net assets resulting from operations to net cash provided by/(used in) operating activities:
Net realized loss on investments	5,020,314	11,947,504	5,905,453
Net change in unrealized (appreciation)/depreciation of investments	18,968,978	(30,453,935)	111,563,592
Amortization of discount on 6.00% Notes due 2026	468,999	319,092	425,550
Amortization of discount on 6.50% Convertible Notes due 2029	73,196
Stock-based compensation	1,738,687	2,448,807	2,015,600
Adjustments to escrow proceeds receivable	(331,816)	117,136	(859,121)
Accrued interest on U.S. Treasury bills	18,150	13,024
Purchases of investments in:
Portfolio investments	(75,064,900)	(24,485,431)	(22,783,388)
U.S. Treasury bills		(253,585,717)	(184,172,673)
Proceeds from sales or maturity of investments in:
Portfolio investments	26,107,936	16,008,100	9,063,919
U.S. Treasury bills	63,792,704	274,792,611	99,173,075
Change in operating assets and liabilities:
Proceeds receivable			52,493
Escrow proceeds receivable	263,995	319,039	1,418,313
Prepaid expenses and other assets	(361,028)	232,404	210,978
Interest and dividends receivable	(623,415)	6,159	(55,111)
Accounts payable and accrued expenses	422,086	(362,519)	(166,220)
Accrued interest payable			(175,000)
Net Cash Provided by /(Used in) Operating Activities	2,369,639	2,383,096	(110,559,593)
Cash Flows from Financing Activities
Proceeds from the issuance of common stock, net			229,896
Gross proceeds from the issuance of 6.50% Convertible Notes due 2029	30,000,000
Deferred debt issuance costs	(1,021,789)
Repurchases of 6.00% Notes due 2026	(30,076,852)
Realized loss on partial repurchase of 6.00% Notes due 2026	183,668
Repurchases of common stock	(9,400,000)	(14,178,685)	(21,452,541)
Deferred financing costs	(53,721)		(1,540)
Cash dividends paid	(143,657)	(143,657)	(26,535,702)
Net Cash Used in Financing Activities	(10,512,351)	(14,322,342)	(47,759,887)
Total Decrease in Cash Balance	(8,142,712)	(11,939,246)	(158,319,480)
Cash Balance at Beginning of Year	28,178,352	40,117,598	198,437,078
Cash Balance at End of Year	20,035,640	28,178,352	40,117,598
Supplemental Information:
Interest paid	4,359,287	4,500,000	4,662,500
Taxes paid	88,692	533,894	82,238
Right of use asset obtained in exchange for operating lease liabilities	$ 466,029