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Condensed Consolidated Statement of Equity (Unaudited) - 6 months ended Jun. 30, 2015 - USD ($)
Total
Common stock
Retained earnings
Noncontrolling interests
Balance, Beginning of Period at Dec. 31, 2014 $ 80,752,791 $ 61,942,410 $ 18,818,263 $ (7,882)
Balance, Beginning of Period, shares at Dec. 31, 2014 17,118,993 17,118,993    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share-based compensation $ 549,603 $ 549,603    
Share-based compensation, shares   86,102    
Exercise of options and related tax benefit 335,321 $ 335,321    
Exercise of options and related tax benefit, shares   2,000    
Repurchase of shares (3,356,633) $ (3,356,633)    
Repurchase of shares, shares   (503,602)    
Net income (loss) 420,810   452,279 (31,469)
Balance, End of Period at Jun. 30, 2015 $ 78,701,892 $ 59,470,701 $ 19,270,542 $ (39,351)
Balance, End of Period, shares at Jun. 30, 2015 16,935,764 16,703,493