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Debt - Additional Information (Details) |  |  |  |  |  | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |
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Aug. 29, 2025 USD ($) | Aug. 13, 2025 USD ($) | Oct. 12, 2024 | Nov. 22, 2023 | May 05, 2021 USD ($) | Sep. 30, 2025 USD ($) | Oct. 02, 2025 USD ($) | Sep. 11, 2025 USD ($) | Oct. 03, 2024 USD ($) | Sep. 19, 2024 USD ($) | Jul. 09, 2024 USD ($) | Apr. 25, 2024 USD ($) | Apr. 17, 2024 USD ($) | Aug. 16, 2023 USD ($) | Jul. 09, 2021 USD ($) | Jun. 23, 2021 USD ($) | Feb. 09, 2018 USD ($) | Jan. 19, 2018 USD ($) | Jan. 11, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset coverage ratio |  |  |  |  |  | 168.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, minimum denomination |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument denomination integral multiples |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |  |
GECCM Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 | $ 1,900,000 | $ 43,000,000
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.75%
Percentage of principal amount redeemed |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GECCO Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,500,000 | $ 50,000,000 |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.875% |  |  |
Maturity date |  |  |  |  |  | Jun. 30, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |
GECCZ Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument redemption price of principal amount redeemed | $ 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 40,000,000 |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.75% |  |  |  |  |
Percentage of principal amount redeemed | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
GECCI Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, aggregate principal amount |  |  |  |  |  |  |  |  |  |  | $ 22,000,000 | $ 4,500,000 | $ 30,000,000 |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  | 8.50% |  |  |  |  |  |
Maturity date |  |  |  |  |  | Apr. 30, 2029 |  |  |  |  |  |  |  |  |  |  |  |  |
GECCH Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, aggregate principal amount |  |  |  |  |  |  |  |  | $ 5,400,000 | $ 36,000,000 |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  | 8.125% |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | Dec. 31, 2029 |  |  |  |  |  |  |  |  |  |  |  |  |
GECCG Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, aggregate principal amount |  |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  | 7.75% |  |  |  |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | Dec. 31, 2030 |  |  |  |  |  |  |  |  |  |  |  |  |
GECCG Notes | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, aggregate principal amount |  |  |  |  |  |  | $ 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Revolving Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit maximum borrowing capacity |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage for unused portion |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage decreases |  | 0.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Revolving Line of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility covenant net assets |  | $ 80,000,000 |  |  | $ 80,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Revolving Line of Credit | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility covenant net assets percentage |  |  |  |  | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Revolving Line of Credit | City National Bank |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit commitment maximum borrowing capacity |  | 50,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit maximum borrowing capacity |  | 90,000,000 |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase revolving credit facility in aggregate amount |  | $ 40,000,000 |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit, maturity date |  |  |  | May 05, 2027 | May 05, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  | 5.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Revolving Line of Credit | City National Bank | Minimum Deposit Test Met | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit interest rate |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Revolving Line of Credit | City National Bank | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility covenant net assets percentage |  |  |  |  | 300.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Revolving Line of Credit | City National Bank | Base Rate | Minimum Deposit Test Met |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit interest rate |  |  |  |  | 1.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |

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