XML 117 R110.htm IDEA: XBRL DOCUMENT v3.25.2

Derivative Instruments - Summary of Average Notional Amount and Weighted Average Fixed Rate by Year (Details) - Interest Rate Swaps [Member]	Jun. 30, 2025 USD ($)
Average Notional
Remainder of 2025	$ 300,624,440
2026	290,688,466
2027	213,343,332
2028	155,697,132
2029	119,142,299
2030	19,392,800
2031	11,799,667
2032	9,583,000
2033	6,577,667
2034	$ 2,537,500
Weighted Average Fixed Rate Paid
Remainder of 2025	3.37%
2026	3.39%
2027	3.49%
2028	3.55%
2029	3.47%
2030	3.77%
2031	3.79%
2032	3.71%
2033	3.84%
2034	3.91%

X

- Definition

Average Notional Amount.

+ References

No definition available.

+ Details

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

X

- Definition

Average Notional Amount, Remainder of Fiscal Year

+ References

No definition available.

+ Details

Name:	ghi_AverageNotionalAmountRemainderOfFiscalYear
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Average Notional Amount, Year 1

+ References

No definition available.

+ Details

Name:	ghi_AverageNotionalAmountYear1
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Average Notional Amount, Year 2

+ References

No definition available.

+ Details

Name:	ghi_AverageNotionalAmountYear2
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Average Notional Amount, Year 3

+ References

No definition available.

+ Details

Name:	ghi_AverageNotionalAmountYear3
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Average Notional Amount, Year 4

+ References

No definition available.

+ Details

Name:	ghi_AverageNotionalAmountYear4
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Average Notional Amount, Year 5

+ References

No definition available.

+ Details

Name:	ghi_AverageNotionalAmountYear5
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Average Notional Amount, Year 6

+ References

No definition available.

+ Details

Name:	ghi_AverageNotionalAmountYear6
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Average notional amount year 7.

+ References

No definition available.

+ Details

Name:	ghi_AverageNotionalAmountYear7
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Average notional amount year 8.

+ References

No definition available.

+ Details

Name:	ghi_AverageNotionalAmountYear8
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Average notional amount year 9.

+ References

No definition available.

+ Details

Name:	ghi_AverageNotionalAmountYear9
Namespace Prefix:	ghi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Derivative, Weighted Average Fixed Interest Rate, Remainder of Fiscal Year

+ References

No definition available.

+ Details

Name:	ghi_DerivativeWeightedAverageFixedInterestRateRemainderOfFiscalYear
Namespace Prefix:	ghi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Derivative, Weighted Average Fixed Interest Rate, Year 1

+ References

No definition available.

+ Details

Name:	ghi_DerivativeWeightedAverageFixedInterestRateYear1
Namespace Prefix:	ghi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Derivative, Weighted Average Fixed Interest Rate, Year 2

+ References

No definition available.

+ Details

Name:	ghi_DerivativeWeightedAverageFixedInterestRateYear2
Namespace Prefix:	ghi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Derivative, Weighted Average Fixed Interest Rate, Year 3

+ References

No definition available.

+ Details

Name:	ghi_DerivativeWeightedAverageFixedInterestRateYear3
Namespace Prefix:	ghi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Derivative, Weighted Average Fixed Interest Rate, Year 4

+ References

No definition available.

+ Details

Name:	ghi_DerivativeWeightedAverageFixedInterestRateYear4
Namespace Prefix:	ghi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Derivative, Weighted Average Fixed Interest Rate, Year 5

+ References

No definition available.

+ Details

Name:	ghi_DerivativeWeightedAverageFixedInterestRateYear5
Namespace Prefix:	ghi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Derivative, Weighted Average Fixed Interest Rate, Year 6

+ References

No definition available.

+ Details

Name:	ghi_DerivativeWeightedAverageFixedInterestRateYear6
Namespace Prefix:	ghi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Derivative, weighted average fixed interest rate, year 7.

+ References

No definition available.

+ Details

Name:	ghi_DerivativeWeightedAverageFixedInterestRateYear7
Namespace Prefix:	ghi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Derivative, weighted average fixed interest rate, year 8.

+ References

No definition available.

+ Details

Name:	ghi_DerivativeWeightedAverageFixedInterestRateYear8
Namespace Prefix:	ghi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Derivative, weighted average fixed interest rate, year 9.

+ References

No definition available.

+ Details

Name:	ghi_DerivativeWeightedAverageFixedInterestRateYear9
Namespace Prefix:	ghi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted Average Fixed Rate Paid.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: