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OTHER CURRENT ASSETS (Tables)
 12 Months Ended
Dec. 31, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Other Current Assets
   
US dollars
  
   
December 31,
  
(in thousands)
  
2017
    
2016
  
Prepaid expenses
    
27,805
      
22,358
  
Government institutions
    
6,340
      
4,068
  
Deferred installation expenses
    
5,659
      
3,000
  
Advances to suppliers
    
221
      
127
  
Employees
    
308
      
540
  
Others
    
1,061
      
1,395
  
     
41,394
      
31,488