Represents the amount of capital expenditures that can be made and stay in compliance with a debt covenant.

No definition available.

Name:	glgi_DebtInstrumentCovenantCapitalExpenditures
Namespace Prefix:	glgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the amount of dividends and distributions that can be made and stay in compliance with a debt covenant.

+ References

No definition available.

+ Details

Name:	glgi_DebtInstrumentCovenantDividendsAndDistributions
Namespace Prefix:	glgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the amount of interest payments on related party debt that can be made and stay in compliance with a debt covenant.

+ References

No definition available.

+ Details

Name:	glgi_DebtInstrumentCovenantInterestPaymentsOnRelatedPartyDebt
Namespace Prefix:	glgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the maximum amount of unauthorized distributions that the company can make as part of a debt covenant.

+ References

No definition available.

+ Details

Name:	glgi_DebtInstrumentCovenantMaximumAmountOfUnauthorizedDistributions
Namespace Prefix:	glgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of maximum stock repurchase under the covenant of the debt instrument.

+ References

No definition available.

+ Details

Name:	glgi_DebtInstrumentCovenantMaximumStockRepurchase
Namespace Prefix:	glgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents debt service coverage ratio under debt instrument.

+ References

No definition available.

+ Details

Name:	glgi_DebtInstrumentDebtServiceCoverageRatio
Namespace Prefix:	glgi_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the debt to EITDA ratio for a debt instrument.

+ References

No definition available.

+ Details

Name:	glgi_DebtInstrumentDebtToEBITDARatio
Namespace Prefix:	glgi_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents debt to tangible net worth ratio under debt instrument.

+ References

No definition available.

+ Details

Name:	glgi_DebtInstrumentDebtToTangibleNetWorthRatio
Namespace Prefix:	glgi_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of decrease each year for debt to tangible net worth ratio.

+ References

No definition available.

+ Details

Name:	glgi_DebtInstrumentDebtToTangibleNetWorthRatioDecreaseEachYear
Namespace Prefix:	glgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage of prime rate.

+ References

No definition available.

+ Details

Name:	glgi_PrimeRate
Namespace Prefix:	glgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(8))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1F
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1F

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-3

+ Details

Name:	us-gaap_AmortizationOfFinancingCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1B

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the required periodic payments including both interest and principal payments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477734/942-470-50-3

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPayment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-8

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=glgi_IBCLoanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Note 6 - Long-term Debt (Details Textual)				12 Months Ended
Note 6 - Long-term Debt (Details Textual)	Jan. 29, 2027 USD ($)	Jan. 08, 2026 USD ($)	Jul. 29, 2022 USD ($)	May 31, 2026 USD ($)	May 31, 2025 USD ($)	Jul. 06, 2026 USD ($)	Jul. 05, 2026 USD ($)	Jan. 09, 2026	Feb. 05, 2025	Feb. 04, 2025	Feb. 05, 2024 USD ($)	Jan. 14, 2024 USD ($)	Aug. 23, 2021
Prime Rate				6.75%
Amortization of Debt Issuance Costs				$ 29,851	$ 5,159
Debt Instrument, Debt Service Coverage Ratio													1.25
Debt Instrument, Debt to Tangible Net Worth Ratio													4
Debt Instrument, Debt to Tangible Net Worth Ratio, Decrease Each Year													50.00%
Minimum [Member]
Debt Instrument, Debt to Tangible Net Worth Ratio													3
I B C Loan Agreement [Member]
Debt Instrument, Covenant, Maximum Amount of Unauthorized Distributions											$ 1,000,000	$ 1,000,000
Debt Instrument, Covenant, Maximum Stock Repurchase											$ 1,000,000
Debt Instrument, Periodic Payment		$ 250,000
I B C Loan Agreement [Member] \| Subsequent Event [Member]
Debt Instrument, Debt Service Coverage Ratio							1.25
Debt Instrument, Debt to EBITDA Ratio							3
Debt Instrument, Covenant, Capital Expenditures							$ 2,000,000
Debt Instrument, Covenant, Dividends and Distributions							1,000,000
Debt Instrument, Covenant, Interest Payments on Related Party Debt							$ 500,000
I B C Loan Agreement [Member] \| Forecast [Member]
Debt Instrument, Periodic Payment	$ 245,000
I B C Loan Agreement [Member] \| Minimum [Member]
Debt Instrument, Interest Rate, Stated Percentage								6.25%
Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity			$ 6,000,000	$ 1,300,000
Debt Instrument, Interest Rate, Stated Percentage									6.50%	7.50%
Debt Instrument, Basis Spread on Variable Rate			0.50%
Revolving Credit Facility [Member] \| Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity						$ 3,500,000