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3. INVENTORIES (Tables)
 12 Months Ended
May 31, 2017
Inventory Disclosure [Abstract]  
Inventories

 Inventories comprise (in thousands):

 

   May 31,
   2017  2016
Raw materials and sub-assemblies  $4,268   $2,839 
Work in process   2,059    4,151 
Finished goods   277    43 
                                            $6,604   $7,033