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Earnings Per Share: Share-based Payment Arrangement, Option, Activity (Details) - USD ($) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Common Class A [Member] |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Common Stock, Shares, Outstanding | 17,561,521 | 16,557,554 | 16,595,783 | 16,107,779
Exercise of stock options | 80,948 | 33,774 |  |
Dividends | $ 836,263 | $ 404,839 |  |
Conversion of Class C to Class A | 48,527 | 11,162 |  |
Common Class C [Member] |  |  |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |  |  |
Common Stock, Shares, Outstanding | 2,762,630 | 2,551,445 | 2,679,603 | 2,500,887
Exercise of stock options | 0 | 0 |  |
Dividends | $ 131,554 | $ 61,720 |  |
Conversion of Class C to Class A | (48,527) | (11,162) |  |

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