XML 83 R73.htm IDEA: XBRL DOCUMENT
v3.23.3

Governmental Issuer Loans - Summary of Partnership's GIL Investments (Parenthetical) (Details) - Governmental Issuer Loans [Member] - USD ($) $ in Millions | Feb. 01, 2025 | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Floor Rate [Member] | Minimum [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Interest Rate |  | 0.00% | 0.00%
Floor Rate [Member] | Maximum [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Interest Rate |  | 0.85% | 0.85%
Poppy Grove I [Member] | Maximum [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Partnership subordinate loan amount |  | $ 3.8 | $ 3.8
Poppy Grove II [Member] | Maximum [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Partnership subordinate loan amount |  | 2.2 | 2.2
Poppy Grove III [Member] | Maximum [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Partnership subordinate loan amount |  | $ 4.2 | $ 4.2
SOFR [Member] | Sandy Creek Apartments [Member] | Forecast [Member] |  |  |
Governmental Issuer Loans [Line Items] |  |  |
Interest Rate | 2.80% |  |

X
- Definition Governmental issuer loans. + References No definition available. + Details
Name: | ghi_GovernmentalIssuerLoansLineItems
Namespace Prefix: | ghi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Loan financing basis spread on variable rate. + References No definition available. + Details
Name: | ghi_LoanFinancingBasisSpreadOnVariableRate
Namespace Prefix: | ghi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Partnership subordinate loan amount. + References No definition available. + Details
Name: | ghi_PartnershipSubordinateLoanAmount
Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ghi_GovernmentalIssuerLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateFloorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_PoppyGroveOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_PoppyGroveTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_PoppyGroveThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_SandyCreekApartmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |