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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) | Class A Common Stock | Class C Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income | 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 |  |  |  |  | 1,930,318 |  | 1,930,318
Other comprehensive income (loss) |  |  |  | 820 |  |  | 820
Stock-based compensation expense |  |  | 64,704 |  |  |  | 64,704
Exercise of stock options | 8,936 |  | 8,444 |  |  |  | 17,380
Sale of treasury stock |  |  | 295,153 |  |  | 42,343 | 337,496
Purchase of treasury stock |  |  |  |  |  | (112,404) | (112,404)
Stock dividends | 282 | (4) | 489 |  | (769) |  | (2)
Conversion Class C to Class A | 6,560 | (6,560) |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance at Mar. 31, 2019 | 30,625,374 | 4,380,722 | 42,190,568 | (2,003) | 97,131,281 | (276,457) | 174,049,485
Net earnings |  |  |  |  | 3,480,054 |  | 3,480,054
Other comprehensive income (loss) |  |  |  | 716 |  |  | 716
Stock-based compensation expense |  |  | 65,037 |  |  |  | 65,037
Exercise of stock options | 20,274 |  | 9,519 |  |  |  | 29,793
Sale of treasury stock |  |  | 92,605 |  |  | 25,190 | 117,795
Purchase of treasury stock |  |  |  |  |  | (174,704) | (174,704)
Conversion Class C to Class A | 12 | (14) | 2 |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance at Jun. 30, 2019 | 30,645,660 | 4,380,708 | 42,357,731 | (1,287) | 100,611,335 | (425,971) | 177,568,176
Net earnings |  |  |  |  | 3,617,414 |  | 3,617,414
Other comprehensive income (loss) |  |  |  | (255) |  |  | (255)
Stock-based compensation expense |  |  | 65,746 |  |  |  | 65,746
Exercise of stock options | 8,936 | 127,628 | 114,376 |  |  |  | 250,940
Sale of treasury stock |  |  | 88,162 |  |  | 35,400 | 123,562
Purchase of treasury stock |  |  |  |  |  | (553,193) | (553,193)
Conversion Class C to Class A |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance at Sep. 30, 2019 | 30,654,596 | 4,508,336 | 42,626,015 | (1,542) | 104,228,749 | (943,764) | 181,072,390
Stockholders' Equity Attributable to Parent, Beginning 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 |  |  |  |  | 1,424,449 |  | 1,424,449
Other comprehensive income (loss) |  |  |  | (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) |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance 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 (loss) |  |  |  | 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)
Conversion Class C to Class A |  |  |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance 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 (loss) |  |  |  | 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) |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending Balance at Sep. 30, 2020 | $ 33,119,974 | $ 5,098,766 | $ 49,355,124 | $ 19,909,604 | $ 149,428,819 | $ (866,330) | $ 256,045,957

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