7. SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2017	Feb. 29, 2016
Net sales	$ 2,681	$ 1,677	$ 12,215	$ 12,930
Property and equipment, net	861	1,251	861	1,251
US
Net sales	546	1,235	5,419	2,460
Property and equipment, net	808	1,200	808	1,200
Asia
Net sales	2,017	380	6,183	9,529
Property and equipment, net	39	38	39	38
Europe
Net sales	118	62	613	941
Property and equipment, net	$ 14	$ 13	$ 14	$ 13