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Sales (Tables)
6 Months Ended
Jun. 30, 2016
Sales [Abstract]  
Sales to Single Customers Exceeding 10% of Sales
Sales to single customers exceeding 10% of sales:
 
   
Six-month period ended June 30,
 
   
2016
   
2015
 
   
US$ thousands
 
             
Customer “A”
   
9,667
     
6,770
 
Customer “B”
   
6,382
     
*