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14. SEGMENT INFORMATION (Tables)
 12 Months Ended
May 31, 2017
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
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 
                     
2015:                    
  Net sales  $3,648   $4,943   $1,427   $10,018 
  Property and equipment, net   432    34    12    478