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Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2018
Other Current Liabilities [Abstract]  
Schedule of Other Current Liabilities
December 31,
  
   
2018
    
2017
  
   
U.S. Dollars (in thousands)
  
             
Accrued employee compensation and related benefits
    
7,405
      
6,248
  
Commissions
    
6,571
      
4,204
  
Accrued expenses
    
2,861
      
1,306
  
Advances from customers
    
2,729
      
2,552
  
Deferred revenues
    
1,302
      
1,037
  
Accrued warranty costs (1)
    
1,714
      
1,300
  
Government institutions and income tax payable
    
597
      
748
  
                 
     
23,179
      
17,395
  
 
Changes In Product Warranty Obligation
Changes in the accrued warranty costs are as follows:

   
Year Ended December 31,
  
   
2018
    
2017
    
2016
  
   
U.S. Dollars (in thousands)
  
Beginning of year
    
1,300
      
1,102
      
1,113
  
Accruals
    
2,930
      
2,222
      
1,823
  
Usage
    
(2,516
)
    
(2,024
)
    
(1,834
)
                         
Balance at end of year
    
1,714
      
1,300
      
1,102