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7. SEGMENT INFORMATION (Tables)
3 Months Ended
Aug. 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  
Three months ended August 31, 2017:                        
Net sales   $ 1,290     $ 5,660     $ 20     $ 6,970  
Property and equipment, net     1,089       39       12       1,140  
                                 
Three months ended August 31, 2016:                                
Net sales   $ 3,164     $ 1,910     $ 244     $ 5,318  
Property and equipment, net     733       42       14       789