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Consolidated Statements of Equity (USD $)
Total
Preferred stock
Common stock
Retained earnings
Non- controlling interests
Beginning balance at Dec. 31, 2008 $ 17,554,815 $ 2,604,070 $ 13,500,034 $ 1,450,711 $ 0
Beginning balance, shares at Dec. 31, 2008   812,749 9,903,047    
Initial public offering of common stock, net of offering costs, shares     5,000,000    
Initial public offering of common stock, net of offering costs 74,801,596   74,801,596    
Stock-based compensation - employees 606,395   606,395    
Issuance of common stock for services received, shares     20,250    
Issuance of common stock for services received 338,240   338,240    
Stock-based compensation - nonemployees 845,661   845,661    
Conversion of preferred stock into common stock, shares   (812,749) 1,625,498    
Conversion of preferred stock into common stock   (2,604,070) 2,604,070    
Repurchase of common shares, shares     (4,018)    
Repurchase of common shares (52,234)   (52,234)    
Issuance of common stock warrants 97,575   97,575    
Exercise of options and related tax benefit, shares     3,635,709    
Exercise of options and related tax benefit (23,099,591)   (23,099,591)    
Net income 3,058,879     3,091,415 (32,536)
Reclass of redeemable common stock (1,930,000)   (1,930,000)    
Ending balance at Dec. 31, 2009 72,221,336 0 67,711,746 4,542,126 (32,536)
Ending balance, shares at Dec. 31, 2009   0 20,180,486    
Stock-based compensation - employees 688,408   688,408    
Issuance of common stock for services received, shares     5,636    
Issuance of common stock for services received 55,140   55,140    
Stock-based compensation - nonemployees 43,101   43,101    
Repurchase of common shares, shares     (615,455)    
Repurchase of common shares (4,887,247)   (4,887,247)    
Exercise of options and related tax benefit, shares     767,794    
Exercise of options and related tax benefit 5,237,726   5,237,726    
Net income 2,427,011     2,456,680 (29,669)
Reclass of redeemable common stock 1,930,000   1,930,000    
Ending balance at Dec. 31, 2010 77,715,475 0 70,778,874 6,998,806 (62,205)
Ending balance, shares at Dec. 31, 2010 20,338,461 0 20,338,461    
Stock-based compensation - employees 627,353   627,353    
Stock-based compensation - nonemployees, shares     10,144    
Stock-based compensation - nonemployees 128,158   128,158    
Repurchase of common shares, shares     (743,073)    
Repurchase of common shares (4,247,440)   (4,247,440)    
Exercise of options and related tax benefit, shares     415,003    
Exercise of options and related tax benefit 2,985,210   2,985,210    
Net income 5,626,513     5,657,856 (31,343)
Ending balance at Dec. 31, 2011 $ 82,835,269 $ 0 $ 70,272,155 $ 12,656,662 $ (93,548)
Ending balance, shares at Dec. 31, 2011 20,020,535 0 20,020,535