12. OTHER EXPENSE, NET (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2018	May 31, 2017	May 31, 2016
Other Income and Expenses [Abstract]
Foreign exchange (loss) gain	$ (63)	$ (21)	$ (19)
Other income, net	2	0	3
Other expense, net	$ (61)	$ (21)	$ (16)