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Note 21: Stock Compensation Plans: Schedule of Fair Value Option Pricing Model Assumptions (Tables) | 12 Months Ended
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Dec. 31, 2018
Tables/Schedules |
Schedule of Fair Value Option Pricing Model Assumptions |
| 2018 | 2017 | 2016
Expected dividends per share | $1.27 | $0.95 | $0.88
Risk-free interest rate | 2.86% | 2.03% | 1.27%
Expected life of options | 5 years | 5 years | 5 years
Expected volatility | 17.61% | 23.49% | 22.08%
Weighted average fair value of |  |  |
options granted during year | $8.30 | $10.04 | $6.59

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