Document and Entity Information - shares	9 Months Ended
	Feb. 28, 2018	Apr. 10, 2018
Document And Entity Information
Entity Registrant Name	GREYSTONE LOGISTICS, INC.
Entity Central Index Key	0001088413
Document Type	10-Q
Document Period End Date	Feb. 28, 2018
Amendment Flag	false
Current Fiscal Year End Date	--05-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		28,361,201
Trading Symbol	GLGI
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2018