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Schedule of Activity of Stock Option Plans (Details) - USD ($)	9 Months Ended
	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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