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Note 20: Stock Compensation Plans: Schedule of Fair Value Option Pricing Model Assumptions (Tables) | 12 Months Ended
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Dec. 31, 2019
Tables/Schedules |
Schedule of Fair Value Option Pricing Model Assumptions | The fair value of each option award is estimated on the date of the grant using the Black-Scholes option pricing model with the following assumptions for the years ended December 31, 2019, 2018 and 2017:
| 2019 | 2018 | 2017
Expected dividends per share | $1.36 | $1.27 | $0.95
Risk-free interest rate | 1.59% | 2.86% | 2.03%
Expected life of options | 5 years | 5 years | 5 years
Expected volatility | 25.15% | 17.61% | 23.49%
Weighted average fair value of |  |  |
options granted during year | $11.20 | $8.30 | $10.04

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