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13. SEGMENT INFORMATION (Tables)
12 Months Ended
May 31, 2016
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 

2016:                    
  Net sales  $2,957   $10,228   $1,316   $14,501 
  Property and equipment, net   1,151    39    14    1,204 
                     
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