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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