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Borrowings - Additional Information (Details) - USD ($) |  |  |  |  |  |  |  | 12 Months Ended |  |  |
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Jan. 17, 2024 | Jun. 14, 2023 | Nov. 18, 2022 | Aug. 23, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Apr. 15, 2020 | Jun. 30, 2024 | Jun. 30, 2023 | Dec. 04, 2021 | Dec. 04, 2020 | Dec. 05, 2021 | Jun. 21, 2019 | Nov. 20, 2017
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  | $ 43,000,000 | $ 71,900,000 |  |  |  |  |
Fee Paid on Undrawn Amounts |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |
Total borrowings |  |  |  |  |  |  |  | 108,000,000 |  |  |  |  |  |
Redeemed principal amount |  |  |  |  |  |  |  | 2,000 |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fee Paid on Undrawn Amounts |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fee Paid on Undrawn Amounts |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |
Revolving Financing Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Outstanding Amount |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |
London Interbank Offered Rates (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings interest rate spread (percent) |  |  |  |  |  |  |  |  |  |  | 3.55% |  |  |
Bore interest rate per annum |  |  |  |  |  | 3.15% |  |  |  |  |  |  |  |
Fee Paid on Undrawn Amounts |  |  |  |  |  | 0.75% |  |  |  |  |  |  |  |
Term Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings under the Term Financing |  |  |  |  |  |  | $ 102,000,000 |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |
Debt Outstanding Amount |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |
Term Financing | London Interbank Offered Rates (LIBOR) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings interest rate spread (percent) |  |  |  |  |  |  |  |  |  | 3.15% |  |  |  |
Term Financing | Related Party [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 122,000,000 |  |
Capital One Revolving Finance |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings interest rate spread (percent) |  |  | 2.00% |  |  |  |  |  |  |  |  |  |  |
Debt instrument fee percentage |  |  | 1.125% |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000
Line of Credit Facility, remaining borrowing capacity |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  | $ 30,000,000 |
Debt Instrument, maturity date | Jan. 17, 2029 |  |  |  |  | Dec. 05, 2021 |  |  |  |  |  |  |  |
Fee Paid on Undrawn Amounts |  |  | 0.75% |  |  |  |  |  |  |  |  |  |  |
Secured revolving credit facility |  | $ 100,000,000 |  | $ 115,000,000 |  |  |  |  |  |  |  |  |  |
Debt instrument, amendment date one |  | Jun. 14, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, amendment date two | Jan. 17, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Maturity Expiration Date | Jan. 17, 2027 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Outstanding Amount |  |  |  |  |  |  |  | 43,000,000 | 71,900,000 |  |  |  |  |
Reinvestment period |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |
Amortization Period |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |
Debt Instrument, unused borrowing capacity, description |  |  | The Capital One Revolving Financing required the payment of an upfront fee of 1.125% ($1.3 million) of the available borrowings under the Capital One Revolving Financing at the closing, and requires the payment of an unused fee of (i) 0.75% annually for any undrawn amounts below 50% of the Capital One Revolving Financing, (ii) 0.50% annually for any undrawn amounts between 50% and 75% of the Capital One Revolving Financing, and (iii) 0.25% annually for any undrawn amounts above 75% of the Capital One Revolving Financing. Borrowings under the Capital One Revolving Financing are based on a borrowing base. |  |  |  |  |  |  |  |  |  |  |
Accrued Interest Receivable |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |
Capital One Revolving Finance | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fee Paid on Undrawn Amounts |  |  | 50.00% |  |  |  |  |  |  |  |  |  |  |
Capital One Revolving Finance | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fee Paid on Undrawn Amounts |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |
Capital One Revolving Finance | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total borrowings |  |  |  |  |  |  |  | 43,000,000 | 71,900,000 |  |  |  |  |
Capital One Revolving Finance | SPV LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  |  | 167,700,000 | 194,000,000 |  |  |  |  |
Investments at Fair Value |  |  |  |  |  |  |  | 153,400,000 | 181,500,000 |  |  |  |  |
Cash held by trustee |  |  |  |  |  |  |  | 5,000,000 | 8,100,000 |  |  |  |  |
Weighted average outstanding balance |  |  |  |  |  |  |  | $ 63,700,000 | $ 80,400,000 |  |  |  |  |
Weighted average interest rate |  |  |  |  |  |  |  | 8.09% | 5.95% |  |  |  |  |
Capital One Revolving Finance | SOFR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings interest rate spread (percent) |  |  | 3.10% |  |  |  |  |  |  |  |  |  |  |
Payment of an upfront fee |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |
2026 Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, maturity date |  |  |  |  | Apr. 01, 2026 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate during period |  |  |  |  |  |  |  | 5.29% |  |  |  |  |  |
Proceeds from initial public offering |  |  |  |  | $ 65,000,000 |  |  |  |  |  |  |  |  |
Debt instrument interest rate |  |  |  |  | 4.875% |  |  | 4.875% |  |  |  |  |  |
Payments for underwriting expense |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |
Proceeds from sale of notes |  |  |  |  | 63,100,000 |  |  |  |  |  |  |  |  |
Offering expense |  |  |  |  | $ 215,000 |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 65,000,000 |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  | 4.875% |  |  | 4.875% |  |  |  |  |  |
Debt instrument, description of variable rate basis |  |  |  |  |  |  |  | (1) 100% of the principal amount of the 2026 Notes to be redeemed or (2) the sum of the present values of the remaining scheduled payments of principal and interest (exclusive of accrued and unpaid interest to the date of redemption) on the 2026 Notes to be redeemed, discounted to the redemption date on a semi-annual basis (assuming a 360-day year consisting of twelve 30-day months) using the applicable Treasury Rate plus 50 basis points; provided |  |  |  |  |  |
Debt instrument, redemption price, percentage |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |
Redeemed principal amount |  |  |  |  |  |  |  | $ 64,900,000 |  |  |  |  |  |
2026 Notes [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption notice period |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |
2026 Notes [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemption notice period |  |  |  |  |  |  |  | 60 days |  |  |  |  |  |
2026 Notes [Member] | Fair Value, Inputs, Level 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  |  |  |  |  | $ 59,900,000 |  |  |  |  |  |

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