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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Schedule of Net Income Used in Earnings Per Share
During the periods, there were no potential instruments that could be exercised or converted to ordinary shares. The net income and the weighted average number of shares used in computing basic and diluted earnings per share for the years ended December 31, 2018, 2017 and 2016, are as follows:
 
   
US dollars
  
   
Year ended December 31,
  
(in thousands)
  
2018
    
2017
    
2016
  
Net income attributable to stockholder's used for the computation of basic and diluted earnings per share
    
60,675
      
43,794
      
32,139
  
Schedule of Weighted Average Shares Used in Earnings Per Share
   
Number of shares
  
   
Year ended December 31,
  
(in thousands)
  
2018
    
2017
    
2016
  
Weighted average number of shares used in the computation of basic and diluted earnings per share
    
21,077
      
20,968
      
20,968