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Equity (Details Textual)
$ / shares in Units, ₪ / shares in Thousands, ₪ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Aug. 13, 2017
USD ($)
$ / shares
Apr. 09, 2017
Aug. 14, 2016
USD ($)
$ / shares
Aug. 12, 2015
USD ($)
$ / shares
Feb. 05, 2015
USD ($)
$ / shares
Feb. 28, 2018
USD ($)
$ / shares
Feb. 22, 2017
USD ($)
$ / shares
Feb. 21, 2016
USD ($)
$ / shares
Nov. 30, 2014
ILS (₪)
₪ / shares
shares
Aug. 19, 2014
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2007
shares
Oct. 31, 2015
shares
Sep. 04, 2014
USD ($)
$ / shares
Equity (Textual)                                
Reserved ordinary shares for issuance                 1,167           1,167  
Intrinsic value of options exercised | $                     $ 502 $ 112 $ 210      
Unrecognized compensation cost related to non-vested share-based compensation | $                     $ 11          
Accumulated cash dividend distributions of per share | $ / shares $ 0.13   $ 0.085 $ 0.095 $ 0.081   $ 0.085 $ 0.09               $ 0.525
Aggregate dividend value | $ $ 5,779   $ 3,770 $ 4,204 $ 3,582   $ 3,775 $ 3,991               $ 20,111
Dividend paid date Sep. 13, 2017   Sep. 22, 2016 Sep. 10, 2015 Mar. 11, 2015   Apr. 05, 2017 Mar. 17, 2016   Sep. 04, 2014            
Dividend distribution maximum percentage   75.00%                            
Fair value on grant date total | ₪                 ₪ 5,910              
Exercise price of per share | ₪ / shares                 ₪ 5              
Subsequent Event [Member]                                
Equity (Textual)                                
Accumulated cash dividend distributions of per share | $ / shares           $ 0.13                    
Aggregate dividend value | $           $ 5,784                    
Dividend paid date           Mar. 26, 2018                    
2007 Plan [Member]                                
Equity (Textual)                                
Reserved ordinary shares for issuance                           1,500,000    
Additional ordinary shares                         250,000 1,000,000    
Aggregate of ordinary shares for future grants                     1,000,000          
Expiration period                         10 years      
Exercisable                     10 years          
2007 Plan [Member] | Minimum [Member]                                
Equity (Textual)                                
Options vest years                     3 years          
2007 Plan [Member] | Maximum [Member]                                
Equity (Textual)                                
Options vest years                     4 years          
Common Stock [Member]                                
Equity (Textual)                                
Public offering ordinary shares