XML 96 R88.htm IDEA: XBRL DOCUMENT
v3.25.1

Other Assets - Additional Information (Details) - USD ($) | Mar. 31, 2025 | Feb. 28, 2025 | Mar. 31, 2024
--- | --- | --- | ---
Other Assets [Line Items] |  |  |
Principal Outstanding at Date of Redemption |  |  | $ 22,073,000
Taxable GILs [Member] | Poppy Grove I GIL [Member] |  |  |
Other Assets [Line Items] |  |  |
Borrower re-allocated previously provided funding |  | $ 5,200,000 |
Taxable GILs [Member] | Poppy Grove II GIL [Member] |  |  |
Other Assets [Line Items] |  |  |
Borrower re-allocated previously provided funding |  | 1,800,000 |
Taxable GILs [Member] | Poppy Grove III GIL [Member] |  |  |
Other Assets [Line Items] |  |  |
Borrower re-allocated previously provided funding |  | $ 5,700,000 |
Taxable MRBs and Taxable GILs [Member] | TOB Trust [Member] |  |  |
Other Assets [Line Items] |  |  |
Assets held in trust | $ 56,400,000 |  |

X
- Definition Borrower re-allocated previously provided funding. + References No definition available. + Details
Name: | ghi_BorrowerReAllocatedPreviouslyProvidedFunding
Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Mortgage loans on real estate, redemption, face amount. + References No definition available. + Details
Name: | ghi_MortgageLoansOnRealEstateRedemptionFaceAmount
Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other assets. + References No definition available. + Details
Name: | ghi_OtherAssetsLineItems
Namespace Prefix: | ghi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
Name: | us-gaap_AssetsHeldInTrust
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

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

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=ghi_TOBTrustMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |