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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) | Total | Common Stock | Additional Paid in Capital | Accumulated Deficit | Treasury Stock
--- | --- | --- | --- | --- | ---
Beginning Balance, Shares at Dec. 31, 2013 |  | 23,386,780 |  |  |
Beginning Balance, Amount at Dec. 31, 2013 | $ 5,341,866 | $ 23,763 | $ 127,908,328 | $ (121,193,666) | $ (1,396,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 2,105,114 |  |  | 2,105,114 |
Stock-based compensation | 991,948 |  | 991,948 |  |
Stock issued for vested restricted stock awards (in shares) |  | 324,320 |  |  |
Stock issued for vested restricted stock awards | 0 | $ 324 | (324) |  |
Taxes withheld on vested restricted stock | (165,193) |  | (165,193) |  |
Ending Balance, Shares at Dec. 31, 2014 |  | 23,711,100 |  |  |
Ending Balance, Amount at Dec. 31, 2014 | 8,273,735 | $ 24,087 | 128,734,759 | (119,088,552) | (1,396,559)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net income | 2,339,774 |  |  | 2,339,774 |
Stock-based compensation | 707,544 |  | 707,544 |  |
Stock issued for vested restricted stock awards (in shares) |  | 664,781 |  |  |
Stock issued for vested restricted stock awards | (109,527) | $ 665 | (110,192) |  |
Taxes withheld on vested restricted stock | (251,082) |  | (251,082) |  |
Ending Balance, Shares at Dec. 31, 2015 |  | 24,375,881 |  |  |
Ending Balance, Amount at Dec. 31, 2015 | $ 10,960,444 | $ 24,752 | $ 129,081,029 | $ (116,748,778) | $ (1,396,559)

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