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Borrowings (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | May 02, 2024 | Feb. 21, 2024 | Sep. 30, 2023 | Dec. 15, 2022 | Dec. 15, 2022 | Sep. 30, 2022 | Dec. 16, 2021 | Nov. 15, 2021 | Nov. 09, 2021 | Dec. 31, 2018 | Mar. 31, 2018 | Mar. 10, 2018 | Dec. 12, 2016 | Mar. 26, 2013 | Mar. 18, 2013 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 30, 2023 | Jan. 17, 2023 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 30, 2013
Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset coverage percentage | 277.80% |  |  | 270.70% |  |  |  |  |  |  |  |  |  |  |  |  | 277.80% |  |  |  |  |  |
Asset coverage percentage with no approval |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility in terms |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding credit facility | $ 27,600,000 |  |  | $ 28,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |  |  |  |  |  | 2.90% |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% |  |  |  |  |  |
Borrowed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,200,000 |  |  |
Aggregate principal amount | $ 86,734,000 |  |  | $ 85,942,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 86,734,000 |  |  | $ 22,600,000 |  |  |
Aggregate principal amount |  |  |  |  |  | $ 22,521,800 |  |  |  |  |  |  |  |  |  |  | $ 21,971,498 | $ 32,241,942 |  |  |  |  |
Percentage of issued principal payment |  | 5.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount |  | $ 1,661,498 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2023 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.125% |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 55,325,000 | $ 55,325,000 |  | $ 12,000,000 |  | $ 13,000,000 | $ 40,000,000 | $ 3,500,000 | $ 60,000,000 |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Mar. 30, 2023 |  |  |  |  |  |  |
Percentage of unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.125% |  | 6.125% | 6.125% | 6.125%
Sale of debt (in Shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,573,872 |  |  |  |  |  |  |  |  |
Redemption price per share (in Dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 25.03 |  |  |  |  |  |  |  |  |
Net proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,600,000 |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  | $ 300,000 |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |  |
Unsecured Debt [Member] | 2028 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  |  |  |  | 5.25% |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 57,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  |  |  | Nov. 01, 2028 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset coverage percentage |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | $ 62,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset coverage percentage |  |  |  |  |  |  |  |  |  |  |  | 150.00% |  |  |  |  |  |  |  |  |  |  |
Asset coverage percentage with no approval |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  |  |  |
Aggregate principal amount |  |  | $ 12,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset coverage percentage | 200.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200.00% |  |  |  |  |  |
Underwriters [Member] | 2028 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  |  | $ 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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