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7. INVENTORIES (Tables)
9 Months Ended
Feb. 28, 2021
Inventory Disclosure [Abstract]  
Inventories

    Inventories are comprised of the following (in thousands):

 

   February 28,  May 31,
   2021  2020
Raw materials and sub-assemblies  $5,626   $5,055 
Work in process   2,713    2,917 
Finished goods   —      17 
   $8,339   $7,989