13. OTHER (EXPENSE) INCOME, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Other Income and Expenses [Abstract]
Foreign exchange (loss) gain	$ (12)	$ 43	$ (63)
Other income, net	1	1	2
Other (expense) income, net	$ (11)	$ 44	$ (61)