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13. SEGMENT INFORMATION (Tables)
9 Months Ended
Feb. 28, 2019
Segment Reporting [Abstract]  
Company's operations in different geographic areas

    Property and equipment information is based on the physical location of the assets. The following table presents property and equipment information for geographic areas (in thousands):

 

    February 28,     May 31,  
    2019     2018  
United States   $ 934     $ 1,156  
Asia     39       40  
Europe     2       7  
    $ 975     $ 1,203