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Statements of Stockholders' Equity - USD ($) | Common Stock | Additional Paid-In Capital | Retained Earnings / Accumulated Deficit | Total
--- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2014 | $ 5,404 | $ 61,713,995 | $ (60,690,557) | $ 1,028,842
Beginning Balance (in shares) at Dec. 31, 2014 | 5,403,851 |  |  |
Exercise of warrants | $ 125 | 131,125 |  | 131,250
Exercise of warrants (in shares) | 125,271 |  |  |
Exercise of stock options | $ 91 | 155,858 |  | $ 155,949
Exercise of stock options (in shares) | 91,333 |  |  | (91,333)
Stock-based compensation |  | 209,864 |  | $ 209,864
Net income |  |  | 1,817,672 | 1,817,672
Ending Balance at Dec. 31, 2015 | $ 5,620 | 62,210,842 | (58,872,885) | 3,343,577
Ending Balance (in shares) at Dec. 31, 2015 | 5,620,455 |  |  |
Exercise of warrants | $ 146 | 157,999 |  | 158,145
Exercise of warrants (in shares) | 146,095 |  |  |
Exercise of stock options | $ 112 | 178,400 |  | $ 178,512
Exercise of stock options (in shares) | 111,855 |  |  | (111,855)
Stock-based compensation |  | 342,610 |  | $ 342,610
Net income |  |  | 12,147,088 | 12,147,088
Ending Balance at Dec. 31, 2016 | $ 5,878 | $ 62,889,851 | $ (46,725,797) | $ 16,169,932
Ending Balance (in shares) at Dec. 31, 2016 | 5,878,405 |  |  |

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