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6. INVENTORIES (Details) - USD ($)
$ in Thousands
Aug. 31, 2018
May 31, 2018
Inventory, Net [Abstract]    
Raw materials and sub-assemblies $ 6,103 $ 5,747
Work in process 3,248 3,068
Finished goods 234 234
Inventory $ 9,585 $ 9,049 [1]
[1] The condensed consolidated balance sheet at May 31, 2018 has been derived from the audited consolidated financial statements at that date.