XML 81 R71.htm IDEA: XBRL DOCUMENT
v3.23.3

Mortgage Revenue Bonds - Schedule of MRB Redeemed (Details) - Mortgage Revenue Bonds [Member] | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 USD ($) Unit | Sep. 30, 2022 USD ($) Unit | Jan. 31, 2022 USD ($)
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Principal Outstanding at Date of Redemption |  | $ 8,493,040 | $ 31,770,592 | $ 61,055,000
Ohio Properties [Member] | Series A [Member] | Crescent Village, Willow Bend and Postwoods [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Month Redeemed | [1] |  | March |
Units | Unit | [1] |  | 362 |
Original Maturity Date | [1] |  | Jun. 01, 2050 |
Interest Rate | [1] |  | 7.00% |
Principal Outstanding at Date of Redemption | [1] |  | $ 13,544,000 |
Ohio Properties [Member] | Series B [Member] | Crescent Village, Willow Bend and Postwoods [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Month Redeemed | [1] |  | March |
Units | Unit | [1] |  | 362 |
Original Maturity Date | [1] |  | Jun. 01, 2050 |
Interest Rate | [1] |  | 10.00% |
Principal Outstanding at Date of Redemption | [1] |  | $ 3,459,840 |
Bridle Ridge [Member] | Greer, SC [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Month Redeemed |  |  | May |
Units | Unit |  |  | 152 |
Original Maturity Date |  |  | Jan. 01, 2043 |
Interest Rate |  |  | 6.00% |
Principal Outstanding at Date of Redemption |  |  | $ 7,100,000 |
Cross Creek [Member] | Beaufort, SC [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Month Redeemed |  |  | September |
Units | Unit |  |  | 144 |
Original Maturity Date |  |  | Mar. 01, 2049 |
Interest Rate |  |  | 6.15% |
Principal Outstanding at Date of Redemption |  |  | $ 7,666,752 |
Greens Property [Member] | Series A [Member] | Durham NC [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Month Redeemed |  | February 2023 |  |
Units | Unit |  | 168 |  |
Original Maturity Date |  | Oct. 01, 2047 |  |
Interest Rate |  | 6.50% |  |
Principal Outstanding at Date of Redemption |  | $ 7,579,000 |  |
Greens Property [Member] | Series B [Member] | Durham NC [Member] |  |  |  |
Schedule Of Available For Sale Securities [Line Items] |  |  |  |
Month Redeemed |  | February 2023 |  |
Units | Unit |  | 168 |  |
Original Maturity Date |  | Oct. 01, 2047 |  |
Interest Rate |  | 12.00% |  |
Principal Outstanding at Date of Redemption |  | $ 914,040 |  |
[1] | The Ohio Properties consist of Crescent Village, located in Cincinnati, Ohio, Willow Bend, located in Columbus (Hilliard), Ohio and Postwoods, located in Reynoldsburg, Ohio.

X
- Definition Investment owned, redemption month. + References No definition available. + Details
Name: | ghi_InvestmentOwnedRedemptionMonth
Namespace Prefix: | ghi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Mortgage loans on real estate, redemption, face amount. + References No definition available. + Details
Name: | ghi_MortgageLoansOnRealEstateRedemptionFaceAmount
Namespace Prefix: | ghi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maturity date of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, in YYYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Paragraph Column C -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column C)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1 + Details
Name: | srt_MortgageLoanOnRealEstateFinalMaturityDate
Namespace Prefix: | srt_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest rate of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Paragraph Column B -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column B)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1 + Details
Name: | srt_MortgageLoansOnRealEstateInterestRate
Namespace Prefix: | srt_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ghi_MortgageRevenueBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_OhioPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=ghi_FirstMortgageOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ghi_CrescentVillageWillowBendAndPostwoodsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=us-gaap_SecondMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_BridleRidgeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ghi_GreerSouthCarolinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_CrossCreekMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ghi_BeaufortSouthCarolinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis=ghi_GreensPropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionLoanCategoryAxis=us-gaap_FirstMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ghi_DurhamNorthCarolinaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |