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Sales (Tables)
6 Months Ended
Jun. 30, 2019
Sales [Abstract]  
Sales to Single Customers Exceeding 10% of Sales
Sales to single customers exceeding 10% of sales:

      
Six-month period ended June 30,
 
     
2019
   
2018
 
      
US$ thousands
 
               
Customer “A”
   
8,956
     
10,538
 
Customer “B”
   
7,327
     
*
 
Customer “C”
   
*
     
7,515
 

*    Less than 10% of sales.