12. OTHER INCOME (EXPENSE), NET (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2017
Other Income and Expenses [Abstract]
Foreign exchange gain (loss)	$ 43	$ (63)	$ (21)
Other income, net	1	2	0
Other income (expense), net	$ 44	$ (61)	$ (21)