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Consolidated Statements of Shareholders' Equity - USD ($) | Total | Common Stock [Member] Class A Common Stock [Member] | Common Stock [Member] Class B Common Stock [Member] | Additional Paid In Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Noncontrolling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 286,166,200 | $ 15,223 | $ 16,662 | $ 147,987,332 | $ (16,667,085) | $ 154,389,494 | $ 424,574 |
Beginning Balance, shares at Dec. 31, 2017 |  | 15,222,738 | 16,662,743 |  | (3,032,740) |  |  |
Change in accounting principle |  |  |  |  |  | 3,654 | (3,654) |
Issuance of common stock | 29,888 | $ 4 |  | 29,884 |  |  |  |
Issuance of common stock, shares |  | 4,461 |  |  |  |  |  |
Stock-based compensation | 1,945,669 | $ 107 |  | 1,945,562 |  |  |  |
Stock-based compensation, shares |  | 107,137 |  |  |  |  |  |
Adjustment from related party acquisition | 474 |  |  | 474 |  |  |  |
Purchase of treasury stock | (13,780,512) |  |  |  | $ (13,780,512) |  |  |
Purchase of treasury stock, shares |  |  |  |  | (1,393,287) |  |  |
Net income | 6,481,049 |  |  |  |  | 6,481,049 |  |
Cash dividends, $0.20 per common share | (5,475,642) |  |  |  |  | (5,475,642) |  |
Other comprehensive loss | (333,035) |  |  |  |  |  | (333,035) |
Ending balance at Dec. 31, 2018 | 275,034,091 | $ 15,334 | $ 16,662 | 149,963,252 | $ (30,447,597) | 155,398,555 | 87,885 |
Ending Balance, shares at Dec. 31, 2018 |  | 15,334,336 | 16,662,743 |  | (4,426,027) |  |  |
Change in accounting principle | (935,916) |  |  |  |  | (935,916) |  |
Issuance of common stock | 1,172,625 | $ 285 |  | 1,172,340 |  |  |  |
Issuance of common stock, shares |  | 285,296 |  |  |  |  |  |
Stock-based compensation | 2,118,718 | $ 185 |  | 2,118,533 |  |  |  |
Stock-based compensation, shares |  | 185,800 |  |  |  |  |  |
Adjustment from related party acquisition | 474 |  |  | 474 |  |  |  |
Purchase of treasury stock | $ (214,735) |  |  |  | $ (214,735) |  |  |
Purchase of treasury stock, shares | (67,154) |  |  |  | (67,154) |  |  |
Net income | $ 13,383,642 |  |  |  |  | 13,450,224 |  | $ (66,582)
Cash dividends, $0.20 per common share | (5,562,718) |  |  |  |  | (5,562,718) |  |
Other comprehensive loss | (524,223) |  |  |  |  |  | (524,223) |
Ending balance at Dec. 31, 2019 | $ 284,471,958 | $ 15,804 | $ 16,662 | $ 153,254,599 | $ (30,662,332) | $ 162,350,145 | $ (436,338) | $ (66,582)
Ending Balance, shares at Dec. 31, 2019 |  | 15,805,432 | 16,662,743 |  | (4,493,181) |  |  |

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