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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.

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