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v3.25.1

Property Loans - Additional Information (Details) - USD ($) | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Property Loans [Member] |  |
Property Loans Net Of Loan Loss Allowance [Line Items] |  |
Accrued interest receivable | $ 299,000 | $ 354,000

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- Definition Accrued interest receivable + References No definition available. + Details
Name: | ghi_AccruedInterestReceivable
Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Property loans, net of loan loss allowance. + References No definition available. + Details
Name: | ghi_PropertyLoansNetOfLoanLossAllowanceLineItems
Namespace Prefix: | ghi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_InformationByCategoryOfDebtSecurityAxis=ghi_PropertyLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |