7. INVENTORIES (Details) - USD ($) $ in Thousands	Feb. 28, 2018	May 31, 2017
Inventory, Net [Abstract]
Raw materials and sub-assemblies	$ 5,616	$ 4,268
Work in process	3,518	2,059
Finished goods	234	277
Inventory	$ 9,368	$ 6,604	[1]

[1] The condensed consolidated balance sheet at May 31, 2017 has been derived from the audited consolidated financial statements at that date.