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Consolidated Statements of Equity (USD $) | Total | Common stock | Retained earnings | Noncontrolling interest
--- | --- | --- | --- | ---
Equity, balance at Dec. 31, 2009 | $ 72,221,336 | $ 67,711,746 | $ 4,542,126 | $ (32,536)
Equity, common shares outstanding at Dec. 31, 2009 |  | 20,180,486 |  |
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |
Net income attributable to common shareholders | 2,456,680 |  | 2,456,680 |
Net loss at subsidiary attributable to noncontrolling interests | (29,669) |  |  | (29,669)
Net income | 2,427,011 |  |  |
Share-based compensation, shares |  | 5,636 |  |
Share-based compensation, amount | 786,649 | 786,649 |  |
Exercise of options and related tax benefit, shares |  | 767,794 |  |
Exercise of options and related tax benefit | 5,237,726 | 5,237,726 |  |
Repurchase of common shares, shares |  | (615,455) |  |
Repurchase of common shares | (4,887,247) | (4,887,247) |  |
Reclass of redeemable common stock | 1,930,000 | 1,930,000 |  |
Equity, balance at Dec. 31, 2010 | 77,715,475 | 70,778,874 | 6,998,806 | (62,205)
Equity, common shares outstanding at Dec. 31, 2010 |  | 20,338,461 |  |
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |
Net income attributable to common shareholders | 5,657,856 |  | 5,657,856 |
Net loss at subsidiary attributable to noncontrolling interests | (31,343) |  |  | (31,343)
Net income | 5,626,513 |  |  |
Share-based compensation, shares |  | 10,144 |  |
Share-based compensation, amount | 755,511 | 755,511 |  |
Exercise of options and related tax benefit, shares |  | 415,003 |  |
Exercise of options and related tax benefit | 2,985,210 | 2,985,210 |  |
Repurchase of common shares, shares |  | (743,073) |  |
Repurchase of common shares | (4,247,440) | (4,247,440) |  |
Equity, balance at Dec. 31, 2011 | 82,835,269 | 70,272,155 | 12,656,662 | (93,548)
Equity, common shares outstanding at Dec. 31, 2011 |  | 20,020,535 |  |
Increase (Decrease) in Shareholders' Equity [Roll Forward] |  |  |  |
Net income attributable to common shareholders | 5,842,492 |  | 5,842,492 |
Net loss at subsidiary attributable to noncontrolling interests | (36,286) |  |  | (36,286)
Net income | 5,806,206 |  |  |
Share-based compensation, shares |  | 20,199 |  |
Share-based compensation, amount | 632,818 | 632,818 |  |
Exercise of options and related tax benefit, shares |  | 165,182 |  |
Exercise of options and related tax benefit | 4,378,788 | 4,378,788 |  |
Repurchase of common shares, shares |  | (1,268,809) |  |
Repurchase of common shares | (8,086,594) | (8,086,594) |  |
Equity, balance at Dec. 31, 2012 | $ 85,566,487 | $ 67,197,167 | $ 18,499,154 | $ (129,834)
Equity, common shares outstanding at Dec. 31, 2012 |  | 18,937,107 |  |

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