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7. INVENTORIES (Tables)
9 Months Ended
Feb. 29, 2020
Inventory Disclosure [Abstract]  
Inventories

    Inventories are comprised of the following (in thousands):

 

   February 29,  May 31,
   2020  2019
Raw materials and sub-assemblies  $6,449   $5,471 
Work in process   2,875    3,580 
Finished goods   6    10 
   $9,330   $9,061