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

X

- Definition

Commitments and contingencies.

+ References

No definition available.

+ Details

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Namespace Prefix:	gecc_
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X

- Definition

Loans held for investment unfunded loan commitments.

+ References

No definition available.

+ Details

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Namespace Prefix:	gecc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: