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5) Stock Compensation Plans: Schedule of stock inventive plan changes (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Common Class A |  |  |  |  |  |
Shares, Outstanding | 1,039,938 |  | 1,082,088 |  | 1,072,863 | 1,086,053
Shares outstanding | $ 4.34 |  | $ 4.44 |  | $ 4.33 | $ 4.41
Adjustment for effect of stock dividends | 0 |  | 829 |  |  |
Shares Granted | 0 |  | 37,500 |  |  |
Shares Exercised | (32,925) |  | (42,294) |  |  |
Shares Cancelled | 0 |  | 0 |  |  |
Options Exercisable | 1,039,938 |  | 985,366 |  |  |
Options exercisable | $ 4.34 |  | $ 4.42 |  |  |
Available options for future grant | $ 330,371 |  | $ 97,218 |  |  |
Weighted average contractual term of options outstanding | 6 years 3 months 11 days |  | 5 years 6 months 25 days |  |  |
Weighted average contractual term of options exercisable | 6 years 3 months 11 days |  | 5 years 1 month 27 days |  |  |
Aggregated intrinsic value of options outstanding | $ 5,212,677 | [1] | $ 489,237 | [2] |  |
Aggregated intrinsic value of options exercisable | $ 5,212,677 | [1] | $ 471,642 | [2] |  |
Common Class C |  |  |  |  |  |
Shares, Outstanding | 662,666 |  | 684,132 |  | 662,666 | 594,132
Shares outstanding | $ 4.73 |  | $ 5.15 |  | $ 4.73 | $ 5.36
Adjustment for effect of stock dividends | 0 |  | 594,132 |  |  |
Shares Granted | 0 |  | 0 |  |  |
Shares Exercised | 0 |  | 90,000 |  |  |
Shares Cancelled | 0 |  | 0 |  |  |
Options Exercisable | 662,666 |  | 452,381 |  |  |
Options exercisable | $ 4.73 |  | $ 5.39 |  |  |
Available options for future grant | $ 266,500 |  | $ 0 |  |  |
Weighted average contractual term of options outstanding | 6 years 8 months 16 days |  | 5 years 11 months 15 days |  |  |
Weighted average contractual term of options exercisable | 6 years 8 months 16 days |  | 4 years 8 months 12 days |  |  |
Aggregated intrinsic value of options outstanding | $ 3,059,620 | [1] | $ 41,150 | [2] |  |
Aggregated intrinsic value of options exercisable | $ 3,059,620 | [1] | $ 0 | [2] |  |
[1] | The Company used a stock price of $9.35 as of March 31, 2021 to derive intrinsic value.
[2] | The Company used a stock price of $4.27 as of March 31, 2020 to derive intrinsic value.

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