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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventory Disclosure [Abstract]  
Summary of Inventories

           
   
December 31
 
   
2018
   
2019
 
   
US$ thousands
 
             
Raw materials and components
   
19,088
     
20,986
 
Products in process
   
10,883
     
7,137
 
Finished products
   
12,398
     
8,368
 
     
42,369
     
36,491