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7. INVENTORIES (Tables)
6 Months Ended
Nov. 30, 2020
Inventory Disclosure [Abstract]  
Inventories

     Inventories are comprised of the following (in thousands):  

 

   November 30,  May 31,
   2020  2020
Raw materials and sub-assemblies  $6,170   $5,055 
Work in process   2,884    2,917 
Finished goods   3    17 
   $9,057   $7,989