Note 1 - Basis of Financial Statements (Details Textual) - USD ($)		3 Months Ended
Jul. 29, 2022	Aug. 31, 2023	Aug. 31, 2022
Gain Loss From Deconsolidation of Variable Interest Entity		$ 0	$ 569,997
Greystone Real Estate, LLC [Member]
Gain Loss From Deconsolidation of Variable Interest Entity	$ 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