STOCK-BASED COMPENSATION (Details 2) - Stock Option and RSU Transactions [Member] - shares	3 Months Ended		6 Months Ended
	Nov. 30, 2021	Aug. 31, 2021	Nov. 30, 2021
Available shares, beginning	685,000	1,137,000	1,137,000
Options reserved	1,414,000
Options granted	(10,000)	(206,000)
RSUs granted	(14,000)	(238,000)
Options cancelled and adjusted	51	(8)
RSUs - performance grants	(270,000)
Available shares, ending	1,856,000	685,000	1,856,000