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7. INVENTORIES (Tables)
3 Months Ended
Aug. 31, 2020
Inventory Disclosure [Abstract]  
Inventories

    Inventories are comprised of the following (in thousands):

 

   August 31,  May 31,
   2020  2020
Raw materials and sub-assemblies  $5,571   $5,055 
Work in process   2,529    2,917 
Finished goods   2    17 
   $8,102   $7,989