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FINANCING INCOME (EXPENSES), NET (Tables)
 12 Months Ended
Dec. 31, 2017
Other Income, Nonoperating [Abstract]  
Schedule of Financing Income (Expenses), Net
   
US dollars
  
   
Year ended December 31,
  
(in thousands)
  
2017
    
2016
    
2015
  
                   
Short-term interest income, commissions and other
    
258
      
46
      
77
  
Gains in respect of marketable securities
    
397
      
115
      
666
  
Interest income in respect of long-term loans
    
1
      
225
      
-
  
Interest income in respect of deposits
    
1,415
      
1,944
      
773
  
Expenses related to taxes positions
   
(2,246
)
    
-
      
-
  
Exchange rate differences and others, net
    
(814
)
    
(274
)
    
(327
)
     
(989
)
    
2,056
      
1,189