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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, Common [Member]
Total
Beginning balance, value 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 gain (loss) (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, value 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, value 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, value 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, value 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 gain (loss) (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, value 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, value at Dec. 31, 2022 37,516,062 5,779,718 64,767,769 (13,070,277) 202,160,306 (4,366,651) 292,786,927
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2016-13) (671,506) (671,506)
Net earnings 1,240,172 1,240,172
Other comprehensive gain (loss) 4,127,558 4,127,558
Stock-based compensation expense 143,671 143,671
Exercise of stock options 96,092 (62,073) 34,019
Sale of treasury stock (43,493) 620,651 577,158
Purchase of treasury stock (1,204,357) (1,204,357)
Conversion Class C to Class A 1,872 (1,872)
Ending balance, value at Mar. 31, 2023 37,614,026 5,777,846 64,805,874 (8,942,719) 202,728,972 (4,950,357) 297,033,642
Beginning balance, value at Dec. 31, 2022 37,516,062 5,779,718 64,767,769 (13,070,277) 202,160,306 (4,366,651) 292,786,927
Cumulative effect adjustment upon adoption of new accounting standard (ASU 2016-13) [1]             665,030
Net earnings             7,592,878
Ending balance, value at Jun. 30, 2023 39,787,400 5,947,104 71,685,665 (12,894,771) 200,078,709 (5,841,350) 298,762,757
Beginning balance, value at Mar. 31, 2023 37,614,026 5,777,846 64,805,874 (8,942,719) 202,728,972 (4,950,357) 297,033,642
Net earnings 6,352,706 6,352,706
Other comprehensive gain (loss) (3,952,052) (3,952,052)
Stock-based compensation expense 141,954 141,954
Exercise of stock options 159,284 (154,424) 4,860
Sale of treasury stock (54,350) 623,056 568,706
Purchase of treasury stock 126,990 (1,514,049) (1,387,059)
Conversion Class C to Class A 113,930 (113,930)
Vesting of restricted stock units 810 (810)
Stock dividends 1,899,350 283,188 6,820,431 (9,002,969)
Ending balance, value at Jun. 30, 2023 $ 39,787,400 $ 5,947,104 $ 71,685,665 $ (12,894,771) $ 200,078,709 $ (5,841,350) $ 298,762,757
[1] See Note 2 of the notes to the condensed consolidated financial statements