7. INCOME TAXES (Details 1) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2017	May 31, 2016	May 31, 2015
Federal income taxes:
Current	$ 0	$ 0	$ 0
Deferred	0	0	0
State income taxes:
Current	(8)	3	(19)
Deferred	0	0	0
Foreign income taxes:
Current	(17)	(13)	(15)
Deferred	0	0	0
Income tax benefit (expense)	$ (25)	$ (10)	$ (34)