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Consolidated Statements of Changes in Stockholders' Equity - USD ($) | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | ---
Balance at beginning of year (in shares) at Dec. 31, 2013 | 6,091,707 |  |  |
Balance at beginning of year at Dec. 31, 2013 | $ 60,917 | $ 21,527,375 | $ 9,535,980 | $ 31,124,272
Exercise of stock options (in shares) | 28,000 |  |  | 28,000
Exercise of stock options | $ 280 | 101,920 |  | $ 102,200
Stock-based compensation (in shares) | 42,320 |  |  |
Stock-based compensation | $ 423 | 515,510 |  | 515,933
Net income (loss) |  |  | (2,473,530) | $ (2,473,530)
Balance at end of year (in shares) at Dec. 31, 2014 | 6,162,027 |  |  | 6,162,027
Balance at end of year at Dec. 31, 2014 | $ 61,620 | 22,144,805 | 7,062,450 | $ 29,268,875
Exercise of stock options (in shares) |  |  |  | 0
Stock-based compensation (in shares) | 36,108 |  |  |
Stock-based compensation | $ 361 | 750,397 |  | $ 750,758
Net income (loss) |  |  | 3,204,996 | $ 3,204,996
Balance at end of year (in shares) at Dec. 31, 2015 | 6,198,135 |  |  | 6,198,135
Balance at end of year at Dec. 31, 2015 | $ 61,981 | $ 22,895,202 | $ 10,267,446 | $ 33,224,629

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