XML 15 R5.htm IDEA: XBRL DOCUMENT
v3.23.1

Condensed Consolidated Statements of Operations (Unaudited) (Parenthetical) | 3 Months Ended | 15 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2022
Income Statement [Abstract] |  |
Beneficial unit certificates distribution ratio | 0.01044 | 0.0105

X
- Definition Beneficial unit certificates distribution ratio. + References No definition available. + Details
Name: | ghi_BeneficialUnitCertificatesDistributionRatio
Namespace Prefix: | ghi_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_IncomeStatementAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration