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Stock Compensation Plans: Schedule of stock inventive plan changes (Details) - USD ($)
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Common Class A [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares, Outstanding 1,072,863 1,086,053
Shares outstanding $ 4.22 $ 4.41
Adjustment for effect of stock dividends 47,594 29,099
Shares Granted 0 77,000
Shares Exercised (97,313) (78,803)
Shares Cancelled 0 0
Shares, Outstanding, Ending Balance 1,023,144 1,113,349
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance $ 4.29 $ 4.27
Options Exercisable 1,023,144 1,013,955
Options exercisable $ 4.29 $ 4.27
Available options for future grant $ 358,462 $ 325,372
Weighted average contractual term of options outstanding 5 years 2 months 4 days 5 years 11 months 19 days
Weighted average contractual term of options exercisable 5 years 2 months 4 days 5 years 7 months 9 days
Aggregated intrinsic value of options outstanding $ 4,135,399 [1] $ 2,568,502 [2]
Aggregated intrinsic value of options exercisable $ 4,135,399 [1] $ 2,338,090 [2]
Common Class C [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares, Outstanding 662,666 594,132
Shares outstanding $ 4.61 $ 5.36
Adjustment for effect of stock dividends 33,136 22,544
Shares Granted 0 180,000
Shares Exercised 0 0
Shares Cancelled 0 0
Shares, Outstanding, Ending Balance 695,802 796,676
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance $ 4.61 $ 4.87
Options Exercisable 695,802 561,440
Options exercisable $ 4.61 $ 5.11
Available options for future grant $ 279,825 $ 266,500
Weighted average contractual term of options outstanding 6 years 3 months 25 days 6 years 2 months 4 days
Weighted average contractual term of options exercisable 6 years 3 months 25 days 5 years 3 months 25 days
Aggregated intrinsic value of options outstanding $ 2,585,420 [1] $ 1,360,855 [2]
Aggregated intrinsic value of options exercisable $ 2,585,420 [1] $ 823,712 [2]
[1] The Company used a stock price of $8.33 as of June 30, 2021 to derive intrinsic value.
[2] The Company used a stock price of $6.58 as of June 30, 2020 to derive intrinsic value.