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Note 20: Stock Compensation Plans: Schedule of Fair Value Option Pricing Model Assumptions (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Details
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%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 11.20	$ 8.30	$ 10.04

X

- Definition

Represents the per-share monetary value of Expected dividends per share, during the indicated time period.

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- Definition

Represents the description of Expected life of options, during the indicated time period.

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- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)(ii)
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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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-Publisher FASB
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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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