SIGNIFICANT ACCOUNTING POLICIES (Details) - Options Activity - Share-based Payment Arrangement, Option [Member]	3 Months Ended
	Aug. 31, 2020 $ / shares shares
SIGNIFICANT ACCOUNTING POLICIES (Details) - Options Activity [Line Items]
Options Outstanding, Shares | shares	1,789,251
Option Outstanding, Exercise Price Weighted Average | $ / shares	$ 2.75
Option Granted, Shares | shares	171,000
Option Granted, Exercise Price Weighted Average | $ / shares	$ 7.46
Option Exercised, Shares | shares	(12,500)
Option Exercised, Exercise Price Weighted Average | $ / shares	$ 1.20
Option Cancelled or expired, Shares | shares	(22,001)
Option Cancelled or expired, Exercise Price Weighted Average | $ / shares	$ 3.43
Options Outstanding, Shares | shares	1,925,750
Option Outstanding, Exercise Price Weighted Average | $ / shares	$ 3.17