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Shareholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
 12 Months Ended 16 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
Dec. 31, 2009
USD ($)
shares
Dec. 31, 2011
₪ / shares
shares
Shareholders' Equity (Textual)          
Purchased an aggregate amount of ordinary shares | shares       3,165,092  
Total consideration       $ 2,800  
Dividends paid per share | $ / shares $ 0.32 $ 0.27 $ 0.30    
Compensation costs $ 182 $ 137 $ 138    
Total unrecognized compensation costs $ 447        
Total compensation cost not yet recognized, weighted average period for recognition 1 year 4 months 28 days        
Exercise of options issued to employees from treasury shares $ 53 $ 85 171    
Treasury shares | shares 2,352,592 2,398,592      
Treasury value $ 1,554 $ 1,607      
Total intrinsic value of options exercised 70 51 176    
Aggregate intrinsic value of the outstanding options $ 1,100        
Options not exercised, expiration period after the day of grant 5 years        
Aggregate intrinsic value of the exercisable options $ 11        
Paid dividends to shareholders $ 6,200 $ 5,200 $ 5,800    
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 for ordinary shares | shares         1,800,000
Par value granted to employees | ₪ / shares         ₪ 0.01
Options granted exercise price of ordinary shares, description 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 trading day period immediately preceding the date of grant of such option or with an exercise price equal to par value of NIS 0.01. The options were granted with an exercise price equal to par value of NIS 0.01. 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 trading day period immediately preceding the date of grant of such option or with an exercise price equal to par value of NIS 0.01.