Document and Entity Information - USD ($)	12 Months Ended
	May 31, 2018	Aug. 14, 2018	Nov. 30, 2017
Document And Entity Information
Entity Registrant Name	GREYSTONE LOGISTICS, INC.
Entity Central Index Key	0001088413
Document Type	10-K
Document Period End Date	May 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--05-31
Entity a Well-known Seasoned Issuer	No
Entity a Voluntary Filer	No
Entity's Reporting Status Current	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 7,253,460
Entity Common Stock, Shares Outstanding		28,361,201
Trading Symbol	GLGI
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2018