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Consolidated Statements of Equity - USD ($) | Total | Common stock | Retained earnings | Noncontrolling interest
--- | --- | --- | --- | ---
Equity, common shares outstanding at Dec. 31, 2013 |  | 17,985,503 |  |
Equity, balance at Dec. 31, 2013 | $ 79,291,843 | $ 63,073,941 | $ 16,394,540 | $ (176,638)
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |
Net income (loss) attributable to common shareholders | 2,423,723 |  | 2,423,723 |
Net loss at subsidiary attributable to noncontrolling interests | (61,258) |  |  | (61,258)
Net income (loss) | 2,362,465 |  |  |
Share-based compensation, shares |  | 15,300 |  |
Share-based compensation, amount | 760,894 | $ 760,894 |  |
Exercise of options and related tax benefit | 1,653,028 | 1,653,028 |  |
Exercise of options and related tax benefit | 1,000,005 | $ 769,991 |  | 230,014
Repurchase of common shares, shares |  | (881,810) |  |
Repurchase of common shares | (4,315,444) | $ (4,315,444) |  |
Equity, common shares outstanding at Dec. 31, 2014 |  | 17,118,993 |  |
Equity, balance at Dec. 31, 2014 | 80,752,791 | $ 61,942,410 | 18,818,263 | (7,882)
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |
Net income (loss) attributable to common shareholders | 731,351 |  | 731,351 |
Net loss at subsidiary attributable to noncontrolling interests | (60,243) |  |  | (60,243)
Net income (loss) | 671,108 |  |  |
Share-based compensation, shares |  | 86,102 |  |
Share-based compensation, amount | 622,503 | $ 622,503 |  |
Exercise of options and related tax benefit, shares |  | 3,409 |  |
Exercise of options and related tax benefit | 112,348 | $ 112,348 |  |
Repurchase of common shares | $ (5,338,967) | $ (5,338,967) |  |
Equity, common shares outstanding at Dec. 31, 2015 | 16,379,501 | 16,379,501 |  |
Equity, balance at Dec. 31, 2015 | $ 76,819,783 | $ 57,338,294 | 19,549,614 | (68,125)
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |
Net income (loss) attributable to common shareholders | (944,683) |  | (944,683) |
Net loss at subsidiary attributable to noncontrolling interests | (59,255) |  |  | (59,255)
Net income (loss) | (1,003,938) |  |  |
Share-based compensation, shares |  | 223,987 |  |
Share-based compensation, amount | 852,102 | $ 852,102 |  |
Exercise of options and related tax benefit | (1,026,413) | $ (1,026,413) |  |
Repurchase of common shares, shares |  | (529,312) |  |
Repurchase of common shares | $ (2,520,715) |  | (2,520,715) |
Equity, common shares outstanding at Dec. 31, 2016 | 16,074,176 | 16,074,176 |  |
Equity, balance at Dec. 31, 2016 | $ 73,120,819 | $ 54,643,268 | $ 18,604,931 | $ (127,380)

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