Document and Entity Information - shares	9 Months Ended
	Feb. 28, 2021	Apr. 09, 2021
Cover [Abstract]
Entity Registrant Name	GREYSTONE LOGISTICS, INC.
Entity Central Index Key	0001088413
Document Type	10-Q
Document Period End Date	Feb. 28, 2021
Amendment Flag	false
Current Fiscal Year End Date	--05-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business Flag	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		28,361,201
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2021