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v3.22.2.2

Organization - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  | 1 Months Ended | 12 Months Ended | 13 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 15, 2023 | Dec. 15, 2022 | Dec. 15, 2021 | Aug. 20, 2021 | Dec. 15, 2020 | Apr. 30, 2021 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2022 | Oct. 31, 2021 | Mar. 31, 2021 | Nov. 30, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized loss on investments |  |  |  |  |  |  |  |  | $ (11,106) | $ (12,796) | $ (12,682) |  |  |  |
Common stock, par value |  |  |  |  |  |  |  |  | $ 0.001 | $ 0.001 |  | $ 0.001 |  |  |
Common stock shares issued |  |  |  |  |  |  |  |  | 6,464,910 | 108,654 |  |  |  |  |
At The Market Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued |  |  |  |  |  |  |  |  | 2,464,910 | 108,654 |  | 2,573,564 |  |  |
Weighted average price per share of common stock issued |  |  |  |  |  |  |  |  | $ 13.12 | $ 12.91 |  | $ 13.11 |  |  |
Proceeds from issuance of common stock gross |  |  |  |  |  |  |  |  | $ 32,300 | $ 1,400 |  | $ 33,700 |  |  |
Proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 31,900 | 1,400 |  | 33,200 |  |  |
Common stock issued issued |  |  |  |  |  |  |  |  | 41,300 | 73,600 |  | 500 |  |  |
Legal and other offering costs |  |  |  |  |  |  |  |  | $ 100 | $ 400 |  | 100 |  |  |
Equity Distribution Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate offering price |  |  |  | $ 75,000 |  |  |  |  |  |  |  |  |  |  |
Equity Distribution Agreements | At The Market Offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value |  |  |  | $ 0.001 |  |  |  |  |  |  |  |  |  |  |
2026 Notes Payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  |  |  |  |  |  | $ 85,000 | $ 100,000 |
Percentage of public offering price per notes issued |  |  |  |  |  |  |  |  |  |  |  |  | 101.50% | 99.40% |
Debt instrument, interest rate |  |  |  |  |  |  |  |  | 4.25% |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  |  |  |  |  | Apr. 01, 2026 |  |  |  |  |  |
Debt instrument, periodic payment |  |  |  |  |  |  |  |  | semi-annually |  |  |  |  |  |
PennantPark-TSO Senior Loan Fund, LP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of investments to wholly owned subsidiary |  |  |  |  |  | $ 81,400 |  |  |  |  |  |  |  |  |
Sale of investments to wholly owned subsidiary in cash |  |  |  |  |  | 69,500 |  |  |  |  |  |  |  |  |
Sale of investments to wholly owned subsidiary in equity interest |  |  |  |  |  | $ 11,900 |  |  |  |  |  |  |  |  |
Percentage of outstanding class A units |  |  |  |  |  | 23.08% |  |  |  | 23.08% |  |  |  |  |
Net realized loss on investments |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |
Capital commitment |  |  |  |  |  |  |  |  |  | $ 15,300 |  |  |  |  |
Voting interest in general partnership |  |  |  |  |  |  |  |  |  | 4.99% |  |  |  |  |
2023 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notes issued |  |  |  |  |  |  |  |  | $ 97,000 | $ 117,800 |  | 97,000 |  |  | $ 138,600
Debt instrument, interest rate |  |  |  |  |  |  | 4.30% |  |  |  |  |  |  |  |
Debt instrument, periodic payment |  |  |  |  |  |  |  |  | four annual installments |  |  |  |  |  |
Percentage of original principal amount payable |  |  | 15.00% |  | 15.00% |  |  |  |  |  |  |  |  |  |
2023 Notes | Scenario Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of original principal amount payable | 55.00% | 15.00% |  |  |  |  |  |  |  |  |  |  |  |  |
SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility basis points |  |  |  |  |  |  |  |  | 2.25% |  |  |  |  |  |
2031 Asset-Backed Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of preferred shares of securitization issuer |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
2031 Asset-Backed Debt | Class D Secured Deferrable Floating Rate Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of notes issued by securitization issuer |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Maximum | SOFR |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 366,000 |  |  | $ 366,000 |  |  |
First Lien Secured Debt | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of overall portfolio |  |  |  |  |  |  |  |  | 65.00% |  |  |  |  |  |
Second Lien Secured Debt | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of overall portfolio |  |  |  |  |  |  |  |  | 35.00% |  |  |  |  |  |
Floating Rate Loans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of managed assets invested |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |

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