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7. INVENTORIES (Tables)
3 Months Ended
Aug. 31, 2019
Inventory Disclosure [Abstract]  
Inventories

 

    Inventories are comprised of the following (in thousands):

 

    August 31,     May 31,  
    2019     2019  
Raw materials and sub-assemblies   $ 6,499     $ 5,471  
Work in process     2,667       3,580  
Finished goods     51       10  
    $ 9,217     $ 9,061