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Condensed Consolidated Statement of Equity (Unaudited) (USD $)
Total
Common stock
Retained earnings
Non-controlling interests
Balance at Dec. 31, 2011 $ 82,835,269 $ 70,272,155 $ 12,656,662 $ (93,548)
Balance, shares at Dec. 31, 2011 20,020,535 20,020,535    
Stock-based compensation - nonemployees 98,806 98,806    
Stock-based compensation - nonemployees, shares   20,199    
Exercise of options and related tax benefit 2,756,323 2,756,323    
Exercise of options and related tax benefit, shares   162,526    
Stock-based compensation - employees 455,666 455,666    
Repurchase of shares (6,826,394) (6,826,394)    
Repurchase of shares, shares   (1,029,414)    
Net and comprehensive income 4,012,251   4,036,992 (24,741)
Balance at Sep. 30, 2012 $ 83,331,921 $ 66,756,556 $ 16,693,654 $ (118,289)
Balance, shares at Sep. 30, 2012 19,173,846 19,173,846