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Schedule of Activity of Stock Option Plans (Details) - USD ($) | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020
Common Class A [Member] |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Common stock, shares, outstanding, beginning | 16,595,783 | 16,107,779
Exercise of stock options | 111,608 | 33,774
Exercise of stock options | 134,362 | 78,803
Stock dividends | $ 837,410 | $ 405,210
Conversion of class C to class A | 49,247 | 13,224
Common stock, shares, outstanding, ending | 17,594,048 | 16,559,987
Common Class C [Member] |  |
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] |  |
Common stock, shares, outstanding, beginning | 2,679,603 | 2,500,887
Exercise of stock options |  |
Stock dividends | $ 131,553 | $ 61,720
Conversion of class C to class A | (49,247) | (13,224)
Common stock, shares, outstanding, ending | 2,761,909 | 2,549,383

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