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Unaudited Condensed Statement of Stockholders' Equity - 9 months ended Sep. 30, 2017 - USD ($) | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive Loss | Accumulated Deficit
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2016 | $ 45,032,402 | $ 928 | $ 88,582,470 |  |  | $ (43,550,996)
Beginning balance, shares at Dec. 31, 2016 |  | 9,275,062 |  |  |  |
Stock-based compensation | 463,856 |  | 463,856 |  |  |
Exercise of stock options | $ 506,704 | $ 24 | 506,680 |  |  |
Exercise of stock options, shares | 244,993 | 244,993 |  |  |  |
Shares issued pursuant to stock awards |  | $ 5 | (5) |  |  |
Shares issued pursuant to stock awards, shares |  | 57,475 |  |  |  |
Common stock repurchases | $ (468,823) |  |  | $ (468,823) |  |
Common stock repurchases, shares |  | (52,200) |  |  |  |
Reversal of costs related to secondary offering | 781 |  | 781 |  |  |
Unrealized loss on available-for-sale securities | (1,696) |  |  |  | $ (1,696) |
Net income | 549,323 |  |  |  |  | 549,323
Ending balance at Sep. 30, 2017 | $ 46,082,547 | $ 957 | $ 89,553,782 | $ (468,823) | $ (1,696) | $ (43,001,673)
Ending balance, shares at Sep. 30, 2017 |  | 9,525,330 |  |  |  |

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