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6. INVENTORIES (Tables)
9 Months Ended
Feb. 29, 2016
Inventory Disclosure [Abstract]  
Inventories

    Inventories are comprised of the following (in thousands):

 

    February 29, 2016     May 31, 2015  
Raw materials and sub-assemblies   $ 3,047     $ 4,018  
Work in process     4,331       2,584  
Finished goods     --       521  
    $ 7,378     $ 7,123