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15. SEGMENT INFORMATION (Tables)
 12 Months Ended
May. 31, 2015
Segment Reporting [Abstract]  
Company's operations in different geographic areas

    The following presents information about the Company’s operations in different geographic areas.  Net sales are based upon ship-to location (in thousands).

 

    United                    
    States     Asia     Europe     Total  
2015:                        
  Net sales   $ 3,648     $ 4,943     $ 1,427     $ 10,018  
  Property and equipment, net     432       34       12       478  
                                 
2014:                                
  Net sales   $ 8,708     $ 7,453     $ 3,523     $ 19,684  
  Property and equipment, net     415       42       17       474  
                                 
2013:                                
  Net sales   $ 7,379     $ 8,184     $ 925     $ 16,488  
  Property and equipment, net     249       52       --       301