Lease bears interest rate.

No definition available.

Name:	GLGI_LeaseBearsInterestRate
Namespace Prefix:	GLGI_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Lease payment per invoice rate.

+ References

No definition available.

+ Details

Name:	GLGI_LeasePaymentPerInvoiceRate
Namespace Prefix:	GLGI_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585

+ Details

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

- Definition

Amount before accumulated depreciation of leased physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=84164758&loc=d3e45014-112735

+ Details

Name:	us-gaap_CapitalLeasedAssetsGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of minimum lease payments for capital leases.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=84164817&loc=d3e45280-112737

+ Details

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

- Definition

Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=GLGI_FiveYearLeaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=GLGI_AgreementAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LeaseArrangementTypeAxis=GLGI_ThreeYearLeaseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=GLGI_AgreementBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Capital Leases (Details Narrative) - USD ($)		1 Months Ended	12 Months Ended
Capital Leases (Details Narrative) - USD ($)	Feb. 28, 2018	Aug. 31, 2016	May 31, 2018	May 31, 2017
Monthly lease payment			$ 4,335,054
Amortization			$ 594,578	$ 380,233
Five-Year Lease Agreement [Member] \| Agreement A [Member]
Lease bears interest rate	7.40%
Lease maturity date	Feb. 24, 2023
Capital expenditure on fixed assets	$ 2,000,000
Lease payment per invoice rate	$ 3.32
Monthly lease payment	$ 46,000
Three-Year Lease Agreement [Member] \| Agreement B [Member]
Lease bears interest rate		5.00%
Lease maturity date		Aug. 07, 2019
Capital expenditure on fixed assets		$ 5,400,000
Lease payment per invoice rate		$ 6.25
Monthly lease payment		$ 154,000