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Borrowings - Additional Information (Details) - USD ($) |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 19, 2024 | Jan. 17, 2024 | Jun. 14, 2023 | Nov. 18, 2022 | Aug. 23, 2021 | Mar. 31, 2021 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  | $ 63,500,000 |  | $ 63,500,000 |  | $ 58,500,000
Fee Paid on Undrawn Amounts |  |  |  | 0.50% |  |  |  |  |  |  |
Total borrowings |  |  |  |  |  |  | 128,500,000 |  | 128,500,000 |  | 123,500,000
Redeemed principal amount |  |  |  |  |  |  |  |  | 2,000 |  |
Unamortized discount |  |  |  |  |  |  | (35,555) |  | (35,555) |  | (88,888)
Weighted average outstanding debt |  |  |  |  |  |  | $ 134,900,000 | $ 110,100,000 | $ 126,600,000 | $ 118,000,000 |
Weighted average outstanding debt balance rate |  |  |  |  |  |  | 5.70% | 6.42% | 5.70% | 6.42% |
Minimum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee Paid on Undrawn Amounts |  |  |  | 0.25% |  |  |  |  |  |  |
Weighted average outstanding debt balance rate |  |  |  |  |  |  | 5.49% | 6.29% | 5.49% | 6.29% |
Maximum |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee Paid on Undrawn Amounts |  |  |  | 75.00% |  |  |  |  |  |  |
Capital One Revolving Finance |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument Maturity Expiration Date |  | Jan. 17, 2027 |  |  |  |  |  |  |  |  |
Borrowings interest rate spread (percent) | 2.50% |  |  | 2.00% |  |  |  |  |  |  |
Debt instrument, maturity date |  | Jan. 17, 2029 |  |  |  |  |  |  |  |  |
Fee Paid on Undrawn Amounts |  |  |  | 0.75% |  |  |  |  |  |  |
Secured revolving credit facility |  |  | $ 100,000,000 |  | $ 115,000,000 |  |  |  |  |  |
Debt outstanding amount |  |  |  |  |  |  |  |  | $ 63,500,000 |  | 58,500,000
Reinvestment period |  |  |  |  | 3 years |  |  |  |  |  |
Amortization period |  |  |  |  | 2 years |  |  |  |  |  |
Debt instrument fee percentage |  |  |  | 1.125% |  |  |  |  |  |  |
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. |  |  |  |  |  |  |
Total borrowings |  |  |  |  |  |  | $ 62,700,000 |  | 62,700,000 |  |
Issuance of debt |  |  |  |  |  |  |  |  | 800,000 |  |
Aggregate principal amount |  |  |  |  |  |  | 63,500,000 |  | 63,500,000 |  |
Debt instrument, amendment date one |  |  | Jun. 14, 2023 |  |  |  |  |  |  |  |
Debt instrument, amendment date two |  | Jan. 17, 2024 |  |  |  |  |  |  |  |  |
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 | Level 3 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total borrowings |  |  |  |  |  |  | 63,500,000 |  | 63,500,000 |  | 58,500,000
Capital One Revolving Finance | SPV LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Derivative, notional amount |  |  |  |  |  |  | 167,100,000 |  | 167,100,000 |  | 167,700,000
Investments at fair value |  |  |  |  |  |  | 157,500,000 |  | 157,500,000 |  | 154,700,000
Accrued interest receivable |  |  |  |  |  |  | 1,800,000 |  | 1,800,000 |  | 1,600,000
Cash held by trustee |  |  |  |  |  |  | 7,800,000 |  | 7,800,000 |  | $ 11,300,000
Weighted average outstanding balance |  |  |  |  |  |  | $ 69,900,000 | $ 45,100,000 | $ 61,600,000 | $ 53,000,000 |
Weighted average interest rate |  |  |  |  |  |  | 6.06% | 8.34% | 6.56% | 8.32% |
Capital One Revolving Finance | SOFR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Borrowings interest rate spread (percent) | 3.10% |  |  | 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 |  |  |  |  |  |  |  |  | 4.93% |  | 5.02%
Issuance of debt |  |  |  |  |  |  |  |  | $ 130,000 |  | $ 325,000
Proceeds from initial public offering |  |  |  |  |  | $ 65,000,000 |  |  |  |  |
Debt instrument interest rate |  |  |  |  |  | 4.875% | 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 |  | $ 65,000,000 |  | 65,000,000
Debt instrument, interest rate, stated percentage |  |  |  |  |  | 4.875% | 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 |  |  |  |  |  |  |  |  | $ 64,800,000 |  | 64,600,000
Unamortized discount |  |  |  |  |  |  | $ (35,555) |  | $ (35,555) |  | (88,888)
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] | Level 3 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt, fair value |  |  |  |  |  |  | $ 64,300,000 |  | $ 64,300,000 |  | $ 63,200,000

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