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Commitment and Contingencies - Additional Information (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2025 USD ($)
CLO Formation JV, LLC |
Commitments And Contingencies [Line Items] |
Loans held for investment | $ 46

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- Definition Commitments and contingencies. + References No definition available. + Details
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Namespace Prefix: | gecc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Loans held for investment unfunded loan commitments. + References No definition available. + Details
Name: | gecc_LoansHeldForInvestmentUnfundedLoanCommitments
Namespace Prefix: | gecc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_OwnershipAxis=gecc_CloFormationJvLlcMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |