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Borrowings (Details) - USD ($) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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