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Shareholders Equity - USD ($) | Common Stock | Additional Paid-In Capital | Retained Earnings / Accumulated Deficit | Total
--- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2017 | $ 7,011 | $ 64,777,620 | $ (47,554,208) |
Beginning Balance (in shares) at Dec. 31, 2017 | 7,011,128 |  |  |
Exercise of stock options | $ 122 | 279,055 |  | $ 279,177
Exercise of stock options (in shares) | 121,981 |  |  | 121,981
Stock-based compensation |  | 487,806 |  | $ 487,806
Cost of tender offer | $ (1,250) | (5,020,580) |  | (5,021,830)
Cost of tender offer (in shares) | (1,250,000) |  |  |
Net income (loss) |  |  | (571,141) | (571,141)
Ending Balance at Dec. 31, 2018 | $ 5,883 | 60,523,901 | (48,125,349) | 12,404,435
Ending Balance (in shares) at Dec. 31, 2018 | 5,883,109 |  |  |
Exercise of stock options | $ 25 | 23,289 |  | $ 23,314
Exercise of stock options (in shares) | 24,494 |  |  | 24,494
Stock-based compensation |  | $ 519,891 |  | $ 519,891
Restricted stock grants | 110 | (110) |  | 127,871
Restricted stock grants (in shares) | $ 110,071 |  |  | $ 110,071
Net income (loss) |  | $ 286,586 |  | 286,586
Ending Balance at Dec. 31, 2019 | $ 6,018 | $ 61,066,971 | $ (47,838,763) | $ 13,234,226
Ending Balance (in shares) at Dec. 31, 2019 | 6,017,674 |  |  |

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