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Organization - Additional Information (Details) - USD ($)					1 Months Ended					3 Months Ended		16 Months Ended
	Dec. 15, 2023	Dec. 15, 2022	Dec. 15, 2021	Dec. 15, 2020	Aug. 31, 2021	Apr. 30, 2021	Mar. 31, 2020	Sep. 30, 2019	Nov. 30, 2017	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Sep. 30, 2022	Aug. 20, 2021
Debt Instrument [Line Items]
Notes payable to members										$ 76,200,000		$ 76,200,000	$ 97,000,000.0
Net realized gain on investments										$ 63,000	$ 3,138,000
Common stock, par value										$ 0.001		$ 0.001	$ 0.001
Common stock shares issued										86,177	270,066
2031 Asset-Backed Debt
Debt Instrument [Line Items]
Percentage of preferred shares of securitization issuer								100.00%
2023 Notes
Debt Instrument [Line Items]
Notes payable to members									$ 138,600,000
Debt instrument, interest rate							4.30%
Debt instrument, periodic payment										four annual installments
Percentage of original principal amount payable		15.00%	15.00%	15.00%
Notes issued									$ 138,600,000
Interest payment terms										Interest on the 2023 Notes is payable semi-annually in arrears on June 15 and December 15 of each year, commencing June 15, 2018.
2023 Notes | Scenario Forecast
Debt Instrument [Line Items]
Percentage of original principal amount payable	55.00%
Class D Secured Deferrable Floating Rate Notes | 2031 Asset-Backed Debt
Debt Instrument [Line Items]
Percentage of notes issued by securitization issuer								100.00%
At The Market Offering
Debt Instrument [Line Items]
Common stock shares issued										86,177		2,659,741
Weighted average price per share of common stock issued										$ 11.54		$ 13.06
Proceeds from issuance of common stock gross										$ 1,000,000.0		$ 34,700,000
Proceeds from issuance of common stock										1,000,000.0		34,200,000
Legal and other offering costs										0		0
Common stock issued issued										$ 40,300,000		500,000
Equity Distribution Agreements
Debt Instrument [Line Items]
Aggregate offering price					$ 75,000,000
Equity Distribution Agreements | At The Market Offering
Debt Instrument [Line Items]
Common stock, par value														$ 0.001
PennantPark-TSO Senior Loan Fund, LP
Debt Instrument [Line Items]
Sale of investments to wholly owned subsidiary						$ 81,400,000
Sale of investments to wholly owned subsidiary in cash						69,500,000
Sale of investments to wholly owned subsidiary in equity interest						$ 11,900,000
Percentage of outstanding class A units						23.08%				23.08%
Net realized gain on investments						$ 400,000
Capital commitment										$ 15,300,000		15,300,000
Voting interest in general partnership										4.99%
SOFR
Debt Instrument [Line Items]
Maximum borrowing capacity													$ 300,000,000
Credit facility basis points										225.00%
Maximum | SOFR
Debt Instrument [Line Items]
Maximum borrowing capacity										$ 366,000,000		$ 366,000,000
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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