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Inventories (Tables)
12 Months Ended
Dec. 31, 2017
Inventory Disclosure [Abstract]  
Summary of Inventories
   
December 31
 
   
2016
   
2017
 
   
US$ thousands
 
             
Raw materials and components
   
16,435
     
24,407
 
Products in process
   
19,098
     
15,079
 
Finished products
   
8,747
     
12,001
 
     
44,280
     
51,487