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7. INVENTORIES (Details) - USD ($)
$ in Thousands
Feb. 29, 2020
May 31, 2019
Inventory, Net [Abstract]    
Raw materials and sub-assemblies $ 6,449 $ 5,471
Work in process 2,875 3,580
Finished goods 6 10
Inventory $ 9,330 $ 9,061 [1]
[1] The condensed consolidated balance sheet at May 31, 2019 has been derived from the audited consolidated financial statements at that date.