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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Summary of Significant Accounting Policies  
Schedule of fair value of stock options has been estimated at the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions

 

 

 

 

 

 

 

 

 

 

 

 

    

2016

    

 

2015

    

 

2014

 

 

Risk free interest rate

 
1.3

%  

 
1.4

%  

 
1.6

%  

 

Expected life

 
4.6

years

 
4.6

years

 
4.6

years

 

Expected volatility

 
15.0

%  

 
17.0

%  

 
21.0

%  

 

Expected dividend yield

 
1.0

%  

 
1.0

%  

 
1.0

%