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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

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