XML 146 R131.htm IDEA: XBRL DOCUMENT v3.8.0.1
Note 21: Stock Compensation Plans: Schedule of Fair Value Option Pricing Model Assumptions (Tables)
12 Months Ended
Dec. 31, 2017
Tables/Schedules  
Schedule of Fair Value Option Pricing Model Assumptions

 

 

2017

2016

2015

 

 

 

 

Expected dividends per share

$0.95

$0.88

$0.88

Risk-free interest rate

2.03%

1.27%

1.66%

Expected life of options

5 years

5 years

5 years

Expected volatility

23.49%

22.08%

24.42%

Weighted average fair value of

 

 

 

options granted during year

$10.04

$6.59

$9.59