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7. INVENTORIES (Tables)
9 Months Ended
Feb. 28, 2019
Inventory Disclosure [Abstract]  
Inventories

    Inventories are comprised of the following (in thousands):

 

    February 28,     May 31,  
    2019     2018  
Raw materials and sub-assemblies   $ 5,276     $ 5,747  
Work in process     3,678       3,068  
Finished goods     235       234  
    $ 9,189     $ 9,049