Interest amortized term.

No definition available.

Name:	GLGI_InterestAmortizedTerm
Namespace Prefix:	GLGI_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

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

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

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

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	us-gaap_CounterpartyNameAxis=GLGI_GreystoneAndInternationalBankOfCommerceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Event (Details Narrative) - USD ($)		6 Months Ended	12 Months Ended
Subsequent Event (Details Narrative) - USD ($)	Jan. 10, 2018	Nov. 30, 2017	May 31, 2017
Debt instrument maturity date		Aug. 07, 2019	Aug. 07, 2019
Debt instrument interest rate		5.00%	5.00%
Subsequent Event [Member] \| Term Loan D [Member] \| Minimum [Member]
Debt instrument interest rate	0.50%
Subsequent Event [Member] \| Term Loan D [Member] \| Maximum [Member]
Debt instrument interest rate	4.75%
Subsequent Event [Member] \| Term Loan E [Member] \| Minimum [Member]
Debt instrument interest rate	0.50%
Subsequent Event [Member] \| Term Loan E [Member] \| Maximum [Member]
Debt instrument interest rate	4.75%
Subsequent Event [Member] \| Revolving Loan [Member] \| Minimum [Member]
Debt instrument interest rate	0.50%
Subsequent Event [Member] \| Revolving Loan [Member] \| Maximum [Member]
Debt instrument interest rate	4.75%
Subsequent Event [Member] \| Greystone and International Bank of Commerce [Member] \| Term Loan D [Member]
Debt instrument principal amount	$ 2,500,000
Interest amortized term	4 years
Debt instrument maturity date	Jan. 10, 2022
Subsequent Event [Member] \| Greystone and International Bank of Commerce [Member] \| Term Loan E [Member]
Debt instrument principal amount	$ 1,000,000
Interest amortized term	4 years
Debt instrument maturity date	Jan. 10, 2022
Subsequent Event [Member] \| Greystone and International Bank of Commerce [Member] \| Revolving Loan [Member]
Debt instrument principal amount	$ 3,000,000
Debt instrument maturity date	Jan. 10, 2020