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OTHER CURRENT ASSETS (Tables)
 12 Months Ended
Dec. 31, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Other Current Assets
US dollars
  
   
December 31,
  
(in thousands)
  
2018
    
2017
  
Prepaid expenses
    
32,898
      
27,805
  
Government institutions
    
6,994
      
6,340
  
Deferred installation expenses
    
7,742
      
5,659
  
Advances to suppliers
    
3,061
      
221
  
Employees
    
430
      
308
  
Others
    
1,858
      
1,061
  
     
52,983
      
41,394