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Note 21: Stock Compensation Plans: Options Granted and Intrinsic Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Details      
Share Based Compensation Arrangement By Share Based Payment Award Options Granted Number 186,750 157,800 131,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value $ 2,200 $ 3,000 $ 1,400
Proceeds from Stock Options Exercised 2,300 3,300 2,100
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options 1,600 2,700 1,300
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value 4,700 8,800 13,900
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 3,900 $ 5,700 $ 7,500