7. SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015
Net sales	$ 4,216	$ 4,620	$ 9,534	$ 11,253
Property and equipment, net	793	576	793	576
US
Net sales	1,709	507	4,873	1,225
Property and equipment, net	740	530	740	530
Asia
Net sales	2,256	3,768	4,166	9,149
Property and equipment, net	39	33	39	33
Europe
Net sales	251	345	495	879
Property and equipment, net	$ 14	$ 13	$ 14	$ 13