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Governmental Issuer Loans - Schedule of Principal and Accrued Interest Paid (Details) - Hope on Avalon [Member] - Governmental Issuer Loans [Member]	3 Months Ended
	Mar. 31, 2024 USD ($)
Governmental Issuer Loans [Line Items]
Month Redeemed	2024-01
Principal Proceeds	$ 23,390,000

X

- Definition

Governmental issuer loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	ghi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Month and year of principal and accrued interest redeemed.

+ References

No definition available.

+ Details

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Namespace Prefix:	ghi_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-12

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	duration

X

- Details

Name:	srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_HopeOnAvalonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Period Type: