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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, 2014 | 6,162,027 |  |  |
Balance at Dec. 31, 2014 | $ 61,620 | $ 22,144,805 | $ 7,062,450 | $ 29,268,875
Exercise of stock options (in shares) |  |  |  | 0
Exercise of stock options |  |  |  |
Stock-based compensation (in shares) | 36,108 |  |  |
Stock-based compensation | $ 361 | 750,397 |  | 750,758
Net (loss)/income |  |  | 3,204,996 | $ 3,204,996
Balance (in shares) at Dec. 31, 2015 | 6,198,135 |  |  | 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 |  |  | 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 (loss)/income |  |  | (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 | $ 10,118,332 | $ 34,313,262

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- Definition Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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