6. INVENTORIES (Details) - USD ($) $ in Thousands	Feb. 28, 2017	May 31, 2016
Inventory, Net [Abstract]
Raw materials and sub-assemblies	$ 3,330	$ 2,839
Work-in-process	3,636	4,151
Finished goods	241	43
Inventory	$ 7,207	$ 7,033	[1]

[1] The condensed consolidated balance sheet at May 31, 2016 has been derived from the audited consolidated financial statements at that date.