SIGNIFICANT ACCOUNTING POLICIES (Details) - Options Activity - Share-based Payment Arrangement, Option [Member] - $ / shares	6 Months Ended
	Nov. 30, 2021	Nov. 29, 2021	Nov. 30, 2020
SIGNIFICANT ACCOUNTING POLICIES (Details) - Options Activity [Line Items]
Options Outstanding, Shares | shares	2,081,366	2,081,366
Option Outstanding, Exercise Price Weighted Average | $ / shares	$ 3.59	$ 3.59
Option Granted, Shares | shares		24,000	24,000
Option Granted, Exercise Price Weighted Average | $ / shares		$ 4.25	$ 4.25
Option Exercised, Shares | shares	(21,500)	(21,500)
Option Exercised, Exercise Price Weighted Average | $ / shares		$ 1.64
Option Cancelled or expired, Shares | shares		(24,750)
Option Cancelled or expired, Exercise Price Weighted Average | $ / shares		$ 3.24
Options Outstanding, Shares | shares	2,059,116
Option Outstanding, Exercise Price Weighted Average | $ / shares	$ 3.62