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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, value 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 1,424,449 1,424,449
Other comprehensive income (8,852,313) (8,852,313)
Stock-based compensation expense 65,877 65,877
Exercise of stock options 44,822 (33,930) 10,892
Sale of treasury stock 218,280 264,081 482,361
Purchase of treasury stock (129,608) (129,608)
Stock dividends 2,322 (1,020) 2,292 (3,594)
Conversion Class C to Class A 22,324 (22,324)
Ending balance, value at Mar. 31, 2020 32,285,026 4,978,430 46,343,631 4,874,201 102,677,084 (1,446,109) 189,712,263
Beginning balance, value 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             51,286,265
Ending balance, value at Sep. 30, 2020 33,119,974 5,098,766 49,355,124 19,909,604 149,428,819 (866,330) 256,045,957
Beginning balance, value at Mar. 31, 2020 32,285,026 4,978,430 46,343,631 4,874,201 102,677,084 (1,446,109) 189,712,263
Net earnings 20,557,047 20,557,047
Other comprehensive income 12,019,888 12,019,888
Stock-based compensation expense 101,520 101,520
Exercise of stock options 22,726 (22,726)
Sale of treasury stock 319,676 664,546 984,222
Purchase of treasury stock (760,713) (760,713)
Stock dividends 807,356 124,460 2,175,790 (3,107,607) (1)
Ending balance, value at Jun. 30, 2020 33,115,108 5,102,890 48,917,891 16,894,089 120,126,524 (1,542,276) 222,614,226
Net earnings 29,304,769 29,304,769
Other comprehensive income 3,015,515 3,015,515
Stock-based compensation expense 104,562 104,562
Sale of treasury stock 330,939 886,452 1,217,391
Purchase of treasury stock (210,506) (210,506)
Stock dividends 742 1,732 (2,474)
Conversion Class C to Class A 4,124 (4,124)
Ending balance, value at Sep. 30, 2020 33,119,974 5,098,766 49,355,124 19,909,604 149,428,819 (866,330) 256,045,957
Beginning balance, value 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, value 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, value 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             34,176,924
Ending balance, value at Sep. 30, 2021 35,188,096 5,523,818 57,462,981 20,473,292 179,195,423 (1,127,442) 296,716,168
Beginning balance, value 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, value 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
Net earnings 10,790,730 10,790,730
Other comprehensive income (1,125,206) (1,125,206)
Exercise of stock options 61,320 24,182 85,502
Sale of treasury stock (6,274) 1,338,621 1,332,347
Purchase of treasury stock 42,537 (258,455) (215,918)
Stock dividends 2,294 (2) 8,022 (10,314)
Conversion Class C to Class A 1,440 (1,440)
Ending balance, value at Sep. 30, 2021 $ 35,188,096 $ 5,523,818 $ 57,462,981 $ 20,473,292 $ 179,195,423 $ (1,127,442) $ 296,716,168