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Borrowings (Details) - USD ($)							1 Months Ended			12 Months Ended
Borrowings (Details) - USD ($)	Dec. 15, 2022	Nov. 09, 2021	Mar. 10, 2018	Dec. 12, 2016	Mar. 26, 2013	Mar. 18, 2013	Dec. 16, 2021	Dec. 31, 2018	Dec. 17, 2015	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Nov. 15, 2021	Oct. 31, 2020	Oct. 21, 2020	Mar. 31, 2018	Oct. 30, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Jan. 14, 2016	Dec. 30, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 30, 2013
Borrowings (Details) [Line Items]
Asset coverage percentage										200.00%
Asset coverage percentage with no approval										200.00%
Revolving credit facility in terms	3 years
Revolving credit facility (in Dollars)	$ 50,000,000
Outstanding credit facility (in Dollars)										$ 28,400,000	$ 0
Interest rate										2.90%
Commitment fee percentage										0.25%
Credit facility borrowing, description										the Company borrowed $23.2 million under the Credit Facility and used these proceeds to redeem $22.6 million in aggregate principal amount of the issued and outstanding 2023 Notes, comprising all issued and outstanding 2023 Notes. The 2023 Notes were redeemed at 100% of their principal amount, plus accrued and unpaid interest thereon from September 30, 2022 through, but excluding January 17, 2023 (the “Redemption Date”).
Stock issued (in Dollars)									$ 70,800,000
Aggregate principal amount (in Dollars)	$ 22,521,800							$ 12,000,000							$ 74,012,825						$ 3,250,000
Percentage of principal amount	100.00%													100.00%
Aggregate principal amount per share (in Dollars per share)														$ 25
Aggregate principal amount (in Dollars)										$ 36,441,941	57,500,000
Gain (loss) on extinguishment of debt (in Dollars)								200,000			$ (296,197)	$ (122,355)
Maximum [Member]
Borrowings (Details) [Line Items]
Asset coverage percentage										270.70%	255.00%					200.00%
Minimum [Member]
Borrowings (Details) [Line Items]
Asset coverage percentage										200.00%	200.00%					150.00%
2021 Notes [Member]
Borrowings (Details) [Line Items]
Percentage of unsecured notes									6.50%								6.50%	6.50%	6.50%	6.50%
2023 Notes [Member] \| Unsecured Debt [Member]
Borrowings (Details) [Line Items]
Percentage of unsecured notes						6.125%																6.125%	6.125%	6.125%	6.125%
Aggregate principal amount (in Dollars)					$ 3,500,000	$ 60,000,000
Maturity date						Mar. 30, 2023
Sale of debt (in Shares)				1,573,872
Redemption price per share (in Dollars per share)				$ 25.03
Net proceeds (in Dollars)				$ 38,600,000
Aggregate principal amount (in Dollars)			$ 13,000,000				$ 55,325,000	$ 12,000,000					$ 55,325,000
Gain (loss) on extinguishment of debt (in Dollars)			$ 300,000				$ 300,000
2023 Notes [Member] \| Unsecured Debt [Member] \| Maximum [Member]
Borrowings (Details) [Line Items]
Aggregate principal amount (in Dollars)				$ 40,000,000
2028 Notes [Member] \| Underwriters [Member]
Borrowings (Details) [Line Items]
Aggregate principal amount (in Dollars)		$ 7,500,000
2028 Notes [Member] \| Unsecured Debt [Member]
Borrowings (Details) [Line Items]
Percentage of unsecured notes		5.25%
Aggregate principal amount (in Dollars)		$ 57,500,000
Maturity date		Nov. 01, 2028