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7. INVENTORIES (Details) - USD ($)
$ in Thousands
Feb. 28, 2021
May 31, 2020
Inventory, Net [Abstract]    
Raw materials and sub-assemblies $ 5,626 $ 5,055
Work in process 2,713 2,917
Finished goods 0 17
Inventories $ 8,339 $ 7,989 [1]
[1] The condensed consolidated balance sheet at May 31, 2020 has been derived from the audited consolidated financial statements at that date.