SIGNIFICANT ACCOUNTING POLICIES (Details) - Options Activity - Share-based Payment Arrangement, Option [Member]	3 Months Ended
	Aug. 31, 2021 $ / shares shares
SIGNIFICANT ACCOUNTING POLICIES (Details) - Options Activity [Line Items]
Options Outstanding, Shares | shares | shares	2,081,366
Option Outstanding, Exercise Price Weighted Average | $ / shares | $ / shares	$ 3.59
Option Granted, Shares | shares | shares	24,000
Option Granted, Exercise Price Weighted Average | $ / shares | $ / shares	$ 4.25
Option Exercised, Shares | shares | shares	(1,500)
Option Exercised, Exercise Price Weighted Average | $ / shares | $ / shares	$ 2.68
Option Cancelled or expired, Shares | shares | shares	(22,750)
Option Cancelled or expired, Exercise Price Weighted Average | $ / shares | $ / shares	$ 3.02
Options Outstanding, Shares | shares | shares	2,081,116
Option Outstanding, Exercise Price Weighted Average | $ / shares | $ / shares	$ 3.6