XML 125 R115.htm IDEA: XBRL DOCUMENT
v3.23.1

Derivative Instruments - Summary of Partnership's Interest Rate Cap Agreements (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Derivative [Line Items] |  |  |  |
Derivative, Fair Value - Asset (Liability) | $ 85,662 |  | $ 91,627 |
Barclays Bank PLC [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Purchase Date | 2019-08 |  | 2019-08 |
Derivative, Notional Amount | $ 74,634,658 |  | $ 75,014,903 |
Derivative, Maturity Date | 2024-08 |  | 2024-08 |
Derivative, Effective Capped Rate | 4.50% | [1] | 4.50% | [2]
Derivative, Index | SIFMA |  | SIFMA |
Derivative, Variable Debt Financing Hedged | M31 TEBS | [1] | M31 TEBS | [2]
Derivative, Fair Value - Asset (Liability) | $ 85,662 |  | $ 91,627 |
[1] | See Notes 16 and 23 for additional details.
[2] | See Notes 16 and 23 for additional details.

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

X
- Definition Derivative maturity month and date at point in time. + References No definition available. + Details
Name: | ghi_DerivativeMaturityMonthAndDateAtPointInTime
Namespace Prefix: | ghi_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivative purchase month and year. + References No definition available. + Details
Name: | ghi_DerivativePurchaseMonthAndYear
Namespace Prefix: | ghi_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivative type of certificates + References No definition available. + Details
Name: | ghi_DerivativeTypeOfCertificates
Namespace Prefix: | ghi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeAssetNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value of the assets less the liabilities of a derivative or group of derivatives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
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
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_CounterpartyNameAxis=ghi_BarclaysBankPLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |