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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
Common Stock [Member]
Common Class A [Member]
Common Stock [Member]
Common Class C [Member]
Additional Paid-in Capital [Member]
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Treasury Stock [Member]
Total
Beginning, 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
Net earnings 12,128,715 12,128,715
Other comprehensive income (5,388,522) (5,388,522)
Stock-based compensation expense 39,153 39,153
Exercise of stock options 55,852 33,401 89,253
Sale of treasury stock 290,381 1,632,041 1,922,422
Purchase of treasury stock (910,233) (910,233)
Conversion Class C to Class A 97,054 (97,054)
Ending, Balance at Mar. 31, 2021 33,344,472 5,262,152 50,650,188 17,854,611 165,867,882 (1,111,464) 271,867,841
Beginning, 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
Net earnings             23,386,194
Ending, Balance at Jun. 30, 2021 35,123,042 5,525,260 57,394,514 21,598,498 168,415,007 (2,207,608) 285,848,713
Beginning, Balance at Mar. 31, 2021 33,344,472 5,262,152 50,650,188 17,854,611 165,867,882 (1,111,464) 271,867,841
Net earnings 11,257,479 11,257,479
Other comprehensive income 3,743,887 3,743,887
Exercise of stock options 106,044 7,655 113,699
Sale of treasury stock (38,048) 1,499,862 1,461,814
Purchase of treasury stock (2,596,006) (2,596,006)
Stock dividends 1,672,526 263,108 6,774,719 (8,710,354) (1)
Ending, Balance at Jun. 30, 2021 35,123,042 5,525,260 57,394,514 21,598,498 168,415,007 (2,207,608) 285,848,713
Beginning, Balance at Dec. 31, 2021 35,285,444 5,733,130 57,985,947 18,070,448 184,537,489 (1,845,624) 299,766,834
Net earnings 3,228,718 3,228,718
Other comprehensive income (12,190,330) (12,190,330)
Stock-based compensation expense 271,747 271,747
Exercise of stock options 100,446 (8,487) 91,959
Sale of treasury stock 24,055 1,880,125 1,904,180
Purchase of treasury stock 106,176 (878,417) (772,241)
Conversion Class C to Class A 414 (414)
Ending, Balance at Mar. 31, 2022 35,386,304 5,732,716 58,379,438 5,880,118 187,766,207 (843,916) 292,300,867
Beginning, Balance at Dec. 31, 2021 35,285,444 5,733,130 57,985,947 18,070,448 184,537,489 (1,845,624) 299,766,834
Net earnings             6,803,167
Ending, Balance at Jun. 30, 2022 37,357,376 5,857,422 64,657,027 (4,430,367) 183,273,171 (6,229,574) 280,485,055
Beginning, Balance at Mar. 31, 2022 35,386,304 5,732,716 58,379,438 5,880,118 187,766,207 (843,916) 292,300,867
Net earnings 3,574,449 3,574,449
Other comprehensive income (10,310,485) (10,310,485)
Stock-based compensation expense 220,175 220,175
Exercise of stock options 37,746 (2,440) 35,306
Sale of treasury stock 50,401 1,119,392 1,169,793
Purchase of treasury stock (6,505,050) (6,505,050)
Conversion Class C to Class A 154,218 (154,218)
Stock dividends 1,779,108 278,924 6,009,453 (8,067,485)
Ending, Balance at Jun. 30, 2022 $ 37,357,376 $ 5,857,422 $ 64,657,027 $ (4,430,367) $ 183,273,171 $ (6,229,574) $ 280,485,055