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Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2018
Current assets  
Other Current Assets
December 31,
  
   
2018
    
2017
  
   
U.S. Dollars (in thousands)
  
Due from Government institutions
    
1,442
      
607
  
Income tax receivables
    
453
      
122
  
Prepaid expenses
    
368
      
561
  
Deposits for operating leases
    
193
      
167
  
Due from related parties (See Note 17)
    
133
      
681
  
Other
    
24
      
1,077
  
                 
     
2,613
      
3,215