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Variable Interest Entities - Variable Interest Entities Property Asset Carrying Value and Maximum Exposure (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Accounts Notes And Loans Receivable [Line Items]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	$ 495,018,507	$ 572,142,140
Mortgage Revenue Bonds [Member]
Accounts Notes And Loans Receivable [Line Items]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	120,453,758	98,336,213
Taxable Mortgage Revenue Bonds [Member]
Accounts Notes And Loans Receivable [Line Items]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	3,014,582	13,520,631
Governmental Issuer Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	185,157,300	202,547,300
Taxable Governmental Issuer Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	3,000,000	13,573,000
Property Loans [Member]
Accounts Notes And Loans Receivable [Line Items]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	38,261,960	107,511,750
Investments in Unconsolidated Entities [Member]
Accounts Notes And Loans Receivable [Line Items]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	$ 145,130,907	$ 136,653,246

X

- Definition

Available for Sale Security and Property Loan Receivable, Maximum Exposure - This represents the maximum exposure to loss related to the Available for Sale Securities and Property Loan Receivables.

+ References

No definition available.

+ Details

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Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

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Namespace Prefix:	us-gaap_
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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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