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3. INVENTORIES (Tables)
 12 Months Ended
May. 31, 2015
Inventory Disclosure [Abstract]  
Inventories

     Inventories comprise (in thousands):

 

    May 31,  
    2015     2014  
Raw materials and sub-assemblies   $ 4,018     $ 3,348  
Work in process     2,584       2,585  
Finished goods     521       215  
    $ 7,123     $ 6,148