CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Class A Common Stock	Class C Common Stock	Additional Paid-In Capital	Other Comprehensive Income / Loss	Retained Earnings	Treasury Stock	Total
Stockholders' Equity Attributable to Parent, Beginning Balance at Dec. 31, 2018	$ 30,609,596	$ 4,387,286	$ 41,821,778	$ (2,823)	$ 95,201,732	$ (206,396)	$ 171,811,173
Net earnings					10,893,519		10,893,519
Other comprehensive income				13,729,337			13,729,337
Stock based compensation expense			256,996				256,996
Exercise of stock options	65,034	382,886	415,990				863,910
Sale of treasury stock			529,858			165,702	695,560
Purchase of treasury stock						(1,539,888)	1,539,888
Stock dividends	1,534,356	238,174	3,066,490		(4,839,022)		(2)
Conversion Class C to Class A	6,572	(6,572)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2019	32,215,558	5,001,774	46,091,112	13,726,514	101,256,229	(1,580,582)	196,710,605
Net earnings					55,596,613		55,596,613
Other comprehensive income				9,516,619			9,516,619
Stock based compensation expense			358,878				358,878
Exercise of stock options	137,940	261,640	432,572				832,152
Sale of treasury stock			1,224,877			2,715,071	3,939,948
Purchase of treasury stock						(2,967,761)	2,967,761
Stock dividends	810,420	123,440	2,179,814		(3,113,675)		(1)
Conversion Class C to Class A	27,648	(27,648)
Stockholders' Equity Attributable to Parent, Ending Balance at Dec. 31, 2020	$ 33,191,566	$ 5,359,206	$ 50,287,253	$ 23,243,133	$ 153,739,167	$ (1,833,272)	$ 263,987,053