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14. SEGMENT INFORMATION (Tables)
 12 Months Ended
May 31, 2018
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  
2018:                        
  Net sales   $ 8,446     $ 19,973     $ 1,136     $ 29,555  
  Property and equipment, net      1,156       40       7       1,203  
                                 
2017:                                
  Net sales   $ 7,762     $ 10,439     $ 697     $ 18,898  
  Property and equipment, net     1,364       40       15       1,419  
                                 
2016:                                
  Net sales   $ 2,957     $ 10,228     $ 1,316     $ 14,501  
  Property and equipment, net     1,151       39       14       1,204