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6. INVENTORIES (Tables)
3 Months Ended
Aug. 31, 2018
Inventory Disclosure [Abstract]  
Inventories

    Inventories are comprised of the following (in thousands):

 

    August 31,     May 31,  
    2018     2018  
Raw materials and sub-assemblies   $ 6,103     $ 5,747  
Work in process     3,248       3,068  
Finished goods     234       234  
    $ 9,585     $ 9,049