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Shareholders' Equity (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2008
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2009
Dec. 31, 2011
Shareholders' Equity (Textual)            
Purchased an aggregate amount of ordinary shares 3,165,092       3,165,092  
Total consideration $ 2,800       $ 2,800  
Dividends paid per share   $ 0.26 $ 0.30 $ 0.32    
Compensation costs   $ 200 $ 224 $ 182    
Total unrecognized compensation costs   $ 408        
Total compensation cost not yet recognized, weighted average period for recognition   1 year 5 months 1 day        
Exercise of options issued to employees from treasury shares   $ 39 53    
Treasury shares   1,763,684 2,220,792      
Treasury value   $ 1,204 $ 1,515      
Total intrinsic value of options exercised   115 226 70    
Aggregate intrinsic value of the outstanding options   $ 767        
Options not exercised, expiration period after the day of grant   5 years        
Aggregate intrinsic value of the exercisable options   $ 31        
Paid dividends to shareholders   $ 5,100 $ 5,800 $ 6,200    
Minimum [Member]            
Shareholders' Equity (Textual)            
Outstanding options granted, vesting period   2 years        
Maximum [Member]            
Shareholders' Equity (Textual)            
Outstanding options granted, vesting period   4 years        
2011 Share Incentive Plan [Member]            
Shareholders' Equity (Textual)            
Options granted exercise price of ordinary shares, description   In the years ended December 31, 2019 and 2018, the options were granted with an exercise price equal to par value of NIS 0.01. In the years ended December 31, 2019 and 2018, the options were granted with an exercise price equal to par value of NIS 0.01. In the year ended December 31, 2017, the options were granted with an exercise price equal to the average closing price per share of the Company's ordinary shares on the stock market during the 30-day trading period immediately preceding the date of grant of such option, or with an exercise price equal to par value of NIS 0.01.    
2011 Share Incentive Plan [Member] | Israel, New Shekels [Member]            
Shareholders' Equity (Textual)            
Options for ordinary shares           1,800,000
Par value granted to employees           $ 0.01