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13) Stock Compensation Plans: Schedule of Activity of Stock Option Plans (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Common Class A      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 1,086,053 1,011,274 880,426
Adjustment for the effect of stock dividends 51,018 48,168  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 81,000 142,000  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised (45,834) (42,211)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (11,405) (17,109)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 1,002,603    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 205,664    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value [1] $ 1,291,602    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 1,259,786    
Common Class C      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 594,132 577,280 523,603
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 5.36 $ 5.15 [1]
Adjustment for the effect of stock dividends 28,295 27,491  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted 180,000 90,000  
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised (191,443) 0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ (5.36) $ (5.15) [1]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period 0 (63,814)  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number 405,132    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price $ 5.40    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 0    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term 5 years 9 months 25 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 4 years 6 months 14 days    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value [1] $ 2,177,223    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value $ 159,028    
[1] The Company used a stock price of $5.57 as of December 31, 2019 to derive intrinsic value