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12) Capital Stock: Share-based Compensation, Stock Options, Activity (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Common Class A      
Common Stock, Shares, Outstanding 15,304,798 14,535,577 13,819,006
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 38,473 8,183  
Dividends $ 730,560 $ 692,635  
Conversion of Stock, Shares Issued 188 15,753  
Common Class C      
Common Stock, Shares, Outstanding 2,193,643 2,089,374 1,902,229
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0 103,402  
Dividends $ 104,457 $ 99,496  
Conversion of Stock, Shares Issued (188) (15,753)