13. OTHER (EXPENSE) INCOME, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2021	May 31, 2020	May 31, 2019
Other Income and Expenses [Abstract]
Foreign exchange (loss) gain	$ (111)	$ (12)	$ 43
Other (expense) income, net	(51)	1	1
Other (expense) income, net	$ (162)	$ (11)	$ 44