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Property Loans - Additional Information (Details) - USD ($) | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Property Loans Net Of Loan Loss Allowance [Line Items] |  |  |  |  |
Partnership advanced funds |  |  |  | $ 5,800,000 |
Principal Proceeds |  |  | $ 8,386,000 | 72,776,788 |
Property Loans [Member] |  |  |  |  |
Property Loans Net Of Loan Loss Allowance [Line Items] |  |  |  |  |
Accrued interest receivable | $ 298,000 |  | 298,000 |  | $ 354,000
The Centurion Foundation [Member] |  |  |  |  |
Property Loans Net Of Loan Loss Allowance [Line Items] |  |  |  |  |
Principal Proceeds |  | $ 7,300,000 |  |  |
Magnolia Heights [Member] |  |  |  |  |
Property Loans Net Of Loan Loss Allowance [Line Items] |  |  |  |  |
Partnership recognized loan fee |  | $ 20,000 |  |  |
Opportunity South Carolina [Member] |  |  |  |  |
Property Loans Net Of Loan Loss Allowance [Line Items] |  |  |  |  |
Partnership advanced funds |  |  | $ 624,000 |  |
SoLa Impact Opportunity Zone Fund [Member] |  |  |  |  |
Property Loans Net Of Loan Loss Allowance [Line Items] |  |  |  |  |
Partnership Advanced Additional Funds | $ 6,000,000 |  |  |  |
Interest Rate | 9.00% |  | 9.00% |  |
Principal Proceeds |  |  | $ 556,000 | $ 500,000 |

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

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- Definition Loan financing interest rate. + References No definition available. + Details
Name: | ghi_LoanFinancingInterestRate
Namespace Prefix: | ghi_
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Balance Type: | na
Period Type: | instant

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- Definition Partnership advanced additional funds. + References No definition available. + Details
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Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Partnership capital account advanced fund. + References No definition available. + Details
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Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
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Period Type: | duration

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- Definition Partnership recognized loan fee. + References No definition available. + Details
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Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Proceeds from property loans. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
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Namespace Prefix: |
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- Details
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Period Type: |