XML 122 R112.htm IDEA: XBRL DOCUMENT
v3.23.1

Derivative Instruments - Summary of Terms of Partnership's Total Return Swaps (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2023 | Dec. 31, 2022
Derivative [Line Items] |  |  |  |
Derivative, Notional Amount | $ 218,533,888 |  | $ 194,656,088 |
Mizuho Capital Markets 1 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Trade Date | 2022-02 |  | 2022-02 |
Derivative, Notional Amount | $ 55,990,000 |  | $ 55,990,000 |
Derivative, Period End Variable Rate Received | 4.64% |  | 4.09% |
Derivative, Variable Rate Index | Compounded SOFR |  | Compounded SOFR |
Mizuho Capital Markets 2 [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Trade Date | 2022-03 |  | 2022-03 |
Derivative, Notional Amount | $ 47,850,000 |  | $ 47,850,000 |
Derivative, Period End Variable Rate Received | 4.64% |  | 4.09% |
Derivative, Variable Rate Index | Compounded SOFR |  | Compounded SOFR |
Mizuho Capital Markets [Member] |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, Trade Date | 2022-12 |  | 2022-12 |
Derivative, Notional Amount | $ 102,590,936 |  | $ 102,690,670 |
Derivative, Effective Date | 2022-12 |  | 2022-12 |
Derivative, Termination Date | 2025-09 |  | 2025-09 |
Derivative, Period End Variable Rate Paid | 8.75% | [1] | 7.80% | [2]
Derivative, Period End Variable Rate Received | 14.00% | [3] | 13.05% | [4]
Derivative, Variable Rate Index | SOFR |  | SOFR |
Derivative, Fair Value Liability | $ 199,482 |  | $ 239,612 |
[1] | Variable rate equal to SOFR + 4.00%, subject to an all-in floor of 4.25%.
[2] | Variable rate equal to SOFR + 4.00%, subject to an all-in floor of 4.25%.
[3] | Variable rate equal to SOFR + 9.25%
[4] | Variable rate equal to SOFR + 9.25%.

X
- Definition Derivative effective date. + References No definition available. + Details
Name: | ghi_DerivativeEffectiveDate
Namespace Prefix: | ghi_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivative termination date. + References No definition available. + Details
Name: | ghi_DerivativeTerminationDate
Namespace Prefix: | ghi_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivative trade date. + References No definition available. + Details
Name: | ghi_DerivativeTradeDate
Namespace Prefix: | ghi_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition Derivative variable interest rate paid. + References No definition available. + Details
Name: | ghi_DerivativeVariableInterestRatePaid
Namespace Prefix: | ghi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Derivative variable interest rate received. + References No definition available. + Details
Name: | ghi_DerivativeVariableInterestRateReceived
Namespace Prefix: | ghi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI https://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI https://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 + Details
Name: | us-gaap_DerivativeFairValueOfDerivativeLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Nominal or face amount used to calculate payments on the derivative liability. + 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 (b) -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 (d) -URI https://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeLiabilityNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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_MizuhoCapitalMarketsOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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