Document and Entity Information - USD ($)	12 Months Ended
	May 31, 2019	Aug. 16, 2019	Nov. 30, 2018
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, 2019
Amendment Flag	false
Current Fiscal Year End Date	--05-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filer	No
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 Ex Transition Period	false
Entity Shell Company	false
Entity Public Float			$ 10,043,000
Entity Common Stock, Shares Outstanding		28,361,201
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019