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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) | Class A Common Stock | Class C Common Stock | Additional Paid-In Capital | Other Comprehensive Income / Loss | 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 |  |  |  |  | 10,893,519 |  | 10,893,519
Other comprehensive income |  |  |  | 13,729,337 |  |  | 13,729,337
Stock based compensation expense |  |  | 256,996 |  |  |  | 256,996
Exercise of stock options | 65,034 | 382,886 | 415,990 |  |  |  | 863,910
Sale of treasury stock |  |  | 529,858 |  |  | 165,702 | 695,560
Purchase of treasury stock |  |  |  |  |  | (1,539,888) | 1,539,888
Stock dividends | 1,534,356 | 238,174 | 3,066,490 |  | (4,839,022) |  | (2)
Conversion Class C to Class A | 6,572 | (6,572) |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending 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 |  |  |  |  | 55,596,613 |  | 55,596,613
Other comprehensive income |  |  |  | 9,516,619 |  |  | 9,516,619
Stock based compensation expense |  |  | 358,878 |  |  |  | 358,878
Exercise of stock options | 137,940 | 261,640 | 432,572 |  |  |  | 832,152
Sale of treasury stock |  |  | 1,224,877 |  |  | 2,715,071 | 3,939,948
Purchase of treasury stock |  |  |  |  |  | (2,967,761) | 2,967,761
Stock dividends | 810,420 | 123,440 | 2,179,814 |  | (3,113,675) |  | (1)
Conversion Class C to Class A | 27,648 | (27,648) |  |  |  |  |
Stockholders' Equity Attributable to Parent, Ending 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

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