14. SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	May 31, 2017	Feb. 28, 2017	Nov. 30, 2016	Aug. 31, 2016	May 31, 2016	Feb. 29, 2016	Nov. 30, 2015	Aug. 31, 2015	May 31, 2017	May 31, 2016	May 31, 2015
Net Sales	$ 6,683	$ 2,681	$ 4,216	$ 5,318	$ 1,571	$ 1,677	$ 4,620	$ 6,633	$ 18,898	$ 14,501	$ 10,018
Property and equipment, net	1,419				1,204				1,419	1,204	478
US
Net Sales									7,762	2,957	3,648
Property and equipment, net	1,364				1,151				1,364	1,151	432
Asia
Net Sales									10,439	10,228	4,943
Property and equipment, net	40				39				40	39	34
Europe
Net Sales									697	1,316	1,427
Property and equipment, net	$ 15				$ 14				$ 15	$ 14	$ 12