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7. INVENTORIES (Details) - USD ($)
$ in Thousands
Nov. 30, 2017
May 31, 2017
Inventory, Net [Abstract]    
Raw materials and sub-assemblies $ 5,020 $ 4,268
Work in process 2,970 2,059
Finished goods 235 277
Inventory $ 8,225 $ 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.