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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018 and 2017, are as follows:
 
   
US dollars
  
   
Year ended December 31,
  
(in thousands)
  
2019
    
2018
    
2017
  
Net income attributable to stockholder's used for the computation of basic and diluted earnings per share
    
6,889
      
60,675
      
43,794
Schedule of Weighted Average Shares Used in Earnings Per Share

   
Number of shares
  
   
Year ended December 31,
  
(in thousands)
  
2019
    
2018
    
2017
  
Weighted average number of shares used in the computation of basic and diluted earnings per share
    
21,037
      
21,077
      
20,968