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Condensed Consolidated Statement of Equity (Unaudited) (USD $)
Total
Common stock shares
Retained earnings
Non- controlling interests
Beginning balance at Dec. 31, 2011 $ 82,835,269 $ 70,272,155 $ 12,656,662 $ (93,548)
Beginning balance, shares at Dec. 31, 2011 20,020,535 20,020,535    
Stock-based compensation - nonemployees, shares   17,199    
Stock-based compensation - nonemployees 65,446 65,446    
Exercise of options and related tax benefit, shares   152,626    
Exercise of options and related tax benefit 736,682 736,682    
Stock-based compensation - employees 143,510 143,510    
Repurchase of shares, shares   (319,723)    
Repurchase of shares (2,346,524) (2,346,524)    
Net income 413,841   423,208 (9,367)
Ending balance at Mar. 31, 2012 $ 81,848,224 $ 68,871,269 $ 13,079,870 $ (102,915)
Ending balance, shares at Mar. 31, 2012 19,870,637 19,870,637