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Real Estate Assets - Schedule of Net loss, Exclusive of Gains on Sale (Details) | 3 Months Ended
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Mar. 31, 2022 USD ($)
The 50/50 MF Property [Member] |
Real Estate [Line Items] |
Net loss | $ 222,439

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- Definition Amount of income (loss) from consolidated real estate investments attributed to parent. + References No definition available. + Details
Name: | us-gaap_NetIncomeLossFromRealEstateInvestmentPartnershipAttributableToParent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RealEstateLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_The5050StudentHousingUNLMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |