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Inventories (Tables)
12 Months Ended
Dec. 31, 2018
Inventory Disclosure [Abstract]  
Summary of Inventories
   
December 31
 
   
2017
   
2018
 
   
US$ thousands
 
             
Raw materials and components
   
24,407
     
19,088
 
Products in process
   
15,079
     
10,883
 
Finished products
   
12,001
     
12,398
 
     
51,487
     
42,369