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Statements of Stockholders' Equity - USD ($) | Total | Common Stock | Additional paid-in capital | Retained Earnings | Treasury Stock | Accumulated Other Comprehensive (Loss)
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 10,613,820 | $ 326,115 | $ 10,150,190 | $ 638,672 | $ (450,901) | $ (50,256)
Balance, Shares at Dec. 31, 2015 |  | 3,261,148 |  |  | 206,114 |
Net income (loss) | 508,448 |  |  | 508,448 |  |
Other comprehensive income, net of taxes | 26,354 |  |  |  |  | 26,354
Private placement of common stock, net of offering costs | 3,160,923 | $ 65,988 | 3,094,935 |  |  |
Private placement of common stock, net of offering costs, Shares |  | 659,880 |  |  |  |
Public offering of common stock, net of offering costs | 5,313,223 | $ 112,381 | 5,200,842 |  |  |
Public offering of common stock, net of offering costs, Shares |  | 1,123,810 |  |  |  |
Exercise of stock options | 31,975 |  | 13,017 |  | $ 18,958 |
Exercise of stock options, Shares |  |  |  |  | (8,666) |
Stock-based compensation | 67,399 |  | 67,399 |  |  |
Balance at Dec. 31, 2016 | 19,722,142 | $ 504,484 | 18,526,383 | 1,147,120 | $ (431,943) | (23,902)
Balance, Shares at Dec. 31, 2016 |  | 5,044,838 |  |  | 197,448 |
Net income (loss) | (168,147) |  |  | (168,147) |  |
Other comprehensive income, net of taxes | 23,264 |  |  |  |  | 23,264
Private placement of common stock, net of offering costs | 1,034,164 | $ 20,000 | 1,014,164 |  |  |
Private placement of common stock, net of offering costs, Shares |  | 200,000 |  |  |  |
Public offering of common stock, net of offering costs | 2,734,174 | $ 41,781 | 2,692,393 |  |  |
Public offering of common stock, net of offering costs, Shares |  | 417,807 |  |  |  |
Exercise of stock options | 49,560 |  | 25,496 |  | $ 24,064 |
Exercise of stock options, Shares |  |  |  |  | (11,000) |
Stock-based compensation | 199,783 |  | 199,783 |  |  |
Balance at Dec. 31, 2017 | $ 23,594,940 | $ 566,265 | $ 22,458,219 | $ 978,973 | $ (407,879) | $ (638)
Balance, Shares at Dec. 31, 2017 |  | 5,662,645 |  |  | 186,448 |

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