Stockholders' Equity (Details) - Schedule of reconciliation of the changes in each significant caption of stockholders’ equity - USD ($)	3 Months Ended								12 Months Ended
	Feb. 28, 2023	Nov. 30, 2022	Aug. 31, 2022	May 31, 2022	Feb. 28, 2022	Nov. 30, 2021	Aug. 31, 2021	May 31, 2021	Feb. 28, 2023	Feb. 28, 2022
Common Stock [Member]
Stockholders' Equity (Details) - Schedule of reconciliation of the changes in each significant caption of stockholders’ equity [Line Items]
Balance	$ 11,885	$ 11,927	$ 12,032	$ 12,131	$ 11,747	$ 11,189	$ 11,160	$ 11,161	$ 12,131	$ 11,161
Balance (in Shares)	11,885,479	11,927,238	12,031,998	12,131,350	11,747,004	11,188,912	11,159,995	11,161,416	12,131,350	11,161,416
Balance	$ 11,891	$ 11,885	$ 11,927	$ 12,032	$ 12,131	$ 11,747	$ 11,189	$ 11,160	$ 11,891	$ 12,131
Balance (in Shares)	11,890,500	11,885,479	11,927,238	12,031,998	12,131,350	11,747,004	11,188,912	11,159,995	11,890,500	12,131,350
Increase (Decrease) from Operations:
Net investment income
Net realized gain (loss) from investments
Income tax (provision) benefit from realized gain on investments
Net change in unrealized appreciation (depreciation) on investments
Net change in provision for deferred taxes on unrealized (appreciation) depreciation on investments
Decrease from Shareholder Distributions:
Distributions of investment income – net
Capital Share Transactions:
Proceeds from issuance of common stock					$ 392	$ 520	$ 6
Proceeds from issuance of common stock, shares (in Shares)					392,826	520,076	5,441
Stock dividend distribution	$ 55	$ 53	$ 49	$ 43	$ 42	$ 38	$ 33	$ 39
Stock dividend distribution, shares (in Shares)	53,615	52,312	48,590	42,825	41,520	38,016	33,099	38,580
Repurchases of common stock	$ (49)	$ (95)	$ (154)	$ (142)	$ (50)		$ (10)	$ (40)
Repurchases of common stock, shares (in Shares)	(48,594)	(94,071)	(153,350)	(142,177)	(50,000)		(9,623)	(40,000)
Repurchase fees
Offering costs
Capital Share Transactions:
Tax reclassification of stockholders’ equity in accordance with generally accepted accounting principles
Capital in Excess of Par Value [Member]
Stockholders' Equity (Details) - Schedule of reconciliation of the changes in each significant caption of stockholders’ equity [Line Items]
Balance	$ 321,802,386	$ 322,832,986	$ 325,433,869	328,062,246	321,559,189	305,520,631	304,784,840	304,874,957	$ 328,062,246	$ 304,874,957
Balance	321,893,806	321,802,386	322,832,986	325,433,869	328,062,246	321,559,189	305,520,631	304,784,840	321,893,806	328,062,246
Increase (Decrease) from Operations:
Net investment income
Net realized gain (loss) from investments
Income tax (provision) benefit from realized gain on investments
Net change in unrealized appreciation (depreciation) on investments
Net change in provision for deferred taxes on unrealized (appreciation) depreciation on investments
Decrease from Shareholder Distributions:
Distributions of investment income – net
Capital Share Transactions:
Proceeds from issuance of common stock					11,513,992	15,163,259	157,034
Stock dividend distribution	1,300,405	1,150,881	1,088,139	1,108,637	1,114,886	1,017,625	828,479	914,063
Repurchases of common stock	(1,224,175)	(2,179,600)	(3,685,951)	(3,734,174)	(1,292,843)		(248,713)	(1,003,380)
Repurchase fees	(972)	(1,881)	(3,071)	(2,840)	(1,000)		(192)	(800)
Offering costs					(127,433)	(142,326)	(817)			(127,433)
Capital Share Transactions:
Tax reclassification of stockholders’ equity in accordance with generally accepted accounting principles	16,162				(4,704,545)
Total Distributable Earnings (Loss) [Member]
Stockholders' Equity (Details) - Schedule of reconciliation of the changes in each significant caption of stockholders’ equity [Line Items]
Balance	13,949,329	14,368,362	19,789,910	27,706,146	21,030,809	18,580,025	15,548,756	(700,348)	27,706,146	(700,348)
Balance	25,052,345	13,949,329	14,368,362	19,789,910	27,706,146	21,030,809	18,580,025	15,548,756	25,052,345	27,706,146
Increase (Decrease) from Operations:
Net investment income	9,649,474	9,877,437	7,698,014	7,976,222	5,796,910	5,196,635	6,393,261	2,555,935
Net realized gain (loss) from investments	80,683	(740,434)	7,943,838	162,509	69,664	9,916,925	1,501,597	1,910,141
Income tax (provision) benefit from realized gain on investments				69,250	9,612	(2,447,173)	(448,883)
Net change in unrealized appreciation (depreciation) on investments	10,549,981	(3,176,208)	(13,258,456)	(9,333,449)	2,873,561	(6,042,616)	3,376,540	16,812,577
Net change in provision for deferred taxes on unrealized (appreciation) depreciation on investments	(697,380)	(425,848)	(230,154)	(361,951)	(226,702)	2,480,465	(1,328,711)	(230,144)
Decrease from Shareholder Distributions:
Distributions of investment income – net	(8,081,306)	(6,433,298)	(6,369,981)	(6,428,817)	(6,434,106)	(5,889,329)	(4,910,394)	(4,799,405)
Capital Share Transactions:
Proceeds from issuance of common stock
Stock dividend distribution
Repurchases of common stock
Repurchase fees
Offering costs
Increase (Decrease) from Operations:
Realized losses on extinguishment of debt	(382,274)	479,318	(1,204,809)		(118,147)	(764,123)	(1,552,140)
Capital Share Transactions:
Tax reclassification of stockholders’ equity in accordance with generally accepted accounting principles	(16,162)				4,704,545
Net Assets [Member]
Stockholders' Equity (Details) - Schedule of reconciliation of the changes in each significant caption of stockholders’ equity [Line Items]
Balance	335,763,600	337,213,275	345,235,811	355,780,523	342,601,745	324,111,845	320,344,756	304,185,770	355,780,523	304,185,770
Balance	346,958,042	335,763,600	337,213,275	345,235,811	355,780,523	342,601,745	324,111,845	320,344,756	$ 346,958,042	355,780,523
Increase (Decrease) from Operations:
Net investment income	9,649,474	9,877,437	7,698,014	7,976,222	5,796,910	5,196,635	6,393,261	2,555,935
Net realized gain (loss) from investments	80,683	(740,434)	7,943,838	162,509	69,664	9,916,925	1,501,597	1,910,141
Income tax (provision) benefit from realized gain on investments				69,250	9,612	(2,447,173)	(448,883)
Net change in unrealized appreciation (depreciation) on investments	10,549,981	(3,176,208)	(13,258,456)	(9,333,449)	2,873,561	(6,042,616)	3,376,540	16,812,577
Net change in provision for deferred taxes on unrealized (appreciation) depreciation on investments	(697,380)	(425,848)	(230,154)	(361,951)	(226,702)	2,480,465	(1,328,711)	(230,144)
Decrease from Shareholder Distributions:
Distributions of investment income – net	(8,081,306)	(6,433,298)	(6,369,981)	(6,428,817)	(6,434,106)	(5,889,329)	(4,910,394)	(4,799,405)
Capital Share Transactions:
Proceeds from issuance of common stock					11,514,383	15,163,779	157,040
Stock dividend distribution	1,300,460	1,150,934	1,088,188	1,108,680	1,114,929	1,017,663	828,512	914,102
Repurchases of common stock	(1,224,224)	(2,179,695)	(3,686,105)	(3,734,316)	(1,292,893)		(248,723)	(1,003,420)
Repurchase fees	(972)	(1,881)	(3,071)	$ (2,840)	(1,000)		(192)	(800)
Offering costs					(127,433)	(142,326)	(817)			$ (127,433)
Increase (Decrease) from Operations:
Realized losses on extinguishment of debt	$ (382,274)	$ 479,318	$ (1,204,809)		(118,147)	$ (764,123)	$ (1,552,140)
Capital Share Transactions:
Tax reclassification of stockholders’ equity in accordance with generally accepted accounting principles