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Condensed Consolidated Statement of Equity (Unaudited) (USD $)
Total
Common stock
Retained earnings
Noncontrolling interests
Balance at Dec. 31, 2012 $ 85,566,487 $ 67,197,167 $ 18,499,154 $ (129,834)
Balance, shares at Dec. 31, 2012 18,937,107 18,937,107    
Share-based compensation 302,715 302,715    
Share-based compensation, shares   9,050    
Exercise of options and related tax benefit (26,004) (26,004)    
Exercise of options and related tax benefit, shares   36,758    
Repurchase of shares (3,162,302) (3,162,302)    
Repurchase of shares, shares   (676,551)    
Net and comprehensive income 192,472   215,691 (23,219)
Balance at Jun. 30, 2013 $ 82,873,368 $ 64,311,576 $ 18,714,845 $ (153,053)
Balance, shares at Jun. 30, 2013 18,306,364 18,306,364