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Sales (Tables)
6 Months Ended
Jun. 30, 2017
Sales [Abstract]  
Sales to Single Customers Exceeding 10% of Sales
Sales to single customers exceeding 10% of sales:
 
   
Six-month period ended June 30,
 
   
2017
   
2016
 
   
US$ thousands
 
             
Customer “A”
   
12,979
     
*
 
Customer “B”
   
8,397
     
9,667
 
Customer “C”
   
*
     
6,382
 
 
*
Less than 10% of sales.