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Inventories (Tables)
 12 Months Ended
Dec. 31, 2015
Inventories [Abstract]  
Schedule of Inventories
   
December 31,
  
   
2015
    
2014
  
   
U.S. Dollars
  
Components
     12,739       10,929  
Work in process
     6,453       5,575  
Finished products *
     10,386       9,622  
                 
      29,578       26,126  
Balance Sheet Presentation of Inventories
   
December 31,
  
   
2015
    
2014
  
   
U.S. Dollars
  
Current assets
     27,599       24,650  
Long-term assets (A)
     1,979       1,476  
                 
      29,578       26,126