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v3.19.1

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, 2016 | 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 (loss) income |  |  | 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
Exercise of stock options (in shares) |  |  |  | 0
Exercise of stock options |  |  |  |
Stock-based compensation (in shares) | 77,174 |  |  |
Stock-based compensation | $ 771 | 938,940 |  | 939,711
Net (loss) income |  |  | (5,201,021) | $ (5,201,021)
Balance (in shares) at Dec. 31, 2018 | 6,535,888 |  |  | 6,535,888
Balance at Dec. 31, 2018 | $ 65,358 | $ 26,148,256 | $ 10,178,712 | $ 36,392,326

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