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Debt - Additional Information (Details) |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |
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Jul. 20, 2026 USD ($) | May 27, 2026 USD ($) | Aug. 29, 2025 USD ($) | Aug. 13, 2025 USD ($) | Nov. 22, 2023 | May 05, 2021 USD ($) | Mar. 31, 2026 USD ($) | Jun. 30, 2026 USD ($) | Jun. 08, 2026 | Dec. 31, 2025 USD ($) | 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 ($) | Jun. 23, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit borrowings outstanding |  |  |  |  |  |  |  | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Asset coverage ratio |  |  |  |  |  |  |  | 166.4 |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, minimum denomination |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument denomination integral multiples |  |  |  |  |  |  |  | $ 25 |  |  |  |  |  |  |  |  |  |  |  |
GECCO Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument redemption price of principal amount redeemed |  | $ 18,600,000 |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, aggregate principal amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,500,000 | $ 50,000,000
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.875%
Debt instrument, outstanding principal, repurchased amount |  |  |  |  |  |  | $ 400,000 |  |  | $ 18,500,000 |  |  |  |  |  |  |  |  |  |
Percentage of principal amount redeemed |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
GECCI Notes | Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument redemption price of principal amount redeemed | $ 6,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  | $ 7,500,000 | $ 50,000,000 |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  |  |  |  |  |  | 7.75% |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  |  |  | Dec. 31, 2030 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage for unused portion |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage decreases |  |  |  |  |  | 0.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving line of credit borrowings outstanding |  |  |  |  |  |  |  | $ 11,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  | 5.875% |  |  |  |  | 8.50% |  |  |  |  |  |  |  |  |  |  |
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 Deposit Not Met | Share-Based Payment Arrangement, Tranche One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit interest rate |  |  |  | 3.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior Secured Revolving Line of Credit | City National Bank | Base Rate | Minimum Deposit Test Not Met |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit interest rate |  |  |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2)(i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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- Definition Date the credit facility terminates, in YYYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount of increase (decrease) of the credit facility. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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