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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 127,147 127,147    
Share-based compensation, shares   9,050    
Exercise of options and related tax benefit 437,406 437,406    
Exercise of options and related tax benefit, shares   36,758    
Repurchase of shares (1,942,725) (1,942,725)    
Repurchase of shares, shares   (433,166)    
Net and comprehensive income 841,326   854,709 (13,383)
Balance at Mar. 31, 2013 $ 85,029,641 $ 65,818,995 $ 19,353,863 $ (143,217)
Balance, shares at Mar. 31, 2013 18,549,749 18,549,749