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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 (in shares) at Dec. 31, 2015 | 6,198,135 |  |  |
Balance at Dec. 31, 2015 | $ 61,981 | $ 22,895,202 | $ 10,267,446 | $ 33,224,629
Exercise of stock options (in shares) | 100,000 |  |  | 100,000
Exercise of stock options | $ 1,000 | 461,000 |  | $ 462,000
Stock-based compensation (in shares) | 48,455 |  |  |
Stock-based compensation | $ 485 | 775,272 |  | 775,757
Net income/(loss) |  |  | (149,124) | $ (149,124)
Balance (in shares) at Dec. 31, 2016 | 6,346,590 |  |  | 6,346,590
Balance at Dec. 31, 2016 | $ 63,466 | 24,131,474 | 10,118,322 | $ 34,313,262
Exercise of stock options (in shares) | 36,800 |  |  | 34,000
Exercise of stock options | $ 368 | 145,852 |  | $ 146,220
Stock-based compensation (in shares) | 75,324 |  |  |
Stock-based compensation | $ 753 | 931,990 |  | 932,743
Net income/(loss) |  |  | 5,261,411 | $ 5,261,411
Balance (in shares) at Dec. 31, 2017 | 6,458,714 |  |  | 6,458,714
Balance at Dec. 31, 2017 | $ 64,587 | $ 25,209,316 | $ 15,379,733 | $ 40,653,636

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