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Shareholders Equity - USD ($) | Common Stock | Additional Paid-In Capital | Retained Earnings / Accumulated Deficit | Total
--- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2018 | $ 5,883 | $ 60,523,901 | $ (48,125,349) | $ 12,404,435
Beginning 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) |  |
Restricted stock grants (in shares) | $ 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 |  |  |
Repurchase of common stock | $ (5) | (8,475) |  |
Repurchase of common stock (in shares) | (5,538) |  |  |
Cancellation of restricted stocks | $ (10) | 10 |  |
Cancellation of restricted stocks (in shares) | (9,745) |  |  |
Exercise of stock options | $ 100 | 167,965 |  | $ 168,065
Exercise of stock options (in shares) | 100,239 |  |  | 100,239
Stock-based compensation |  | 507,051 |  | $ 507,051
Net income (loss) |  |  | (3,278,601) | (3,278,601)
Ending Balance at Dec. 31, 2020 | $ 6,103 | $ 61,733,522 | $ (51,117,364) | $ 10,622,261
Ending Balance (in shares) at Dec. 31, 2020 | 6,102,630 |  |  |

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