Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)		12 Months Ended
Jul. 29, 2022	May 31, 2024	May 31, 2023
Gain Loss From Deconsolidation of Variable Interest Entity	$ 569,997	$ 0	$ 569,997

Amount of gain or loss from deconsolidation of variable interest entity.

No definition available.

Name:	glgi_GainLossFromDeconsolidationOfVariableInterestEntity
Namespace Prefix:	glgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration