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Consolidated Statements of Equity - USD ($)
Total
Common stock
Retained earnings
Noncontrolling interest
Equity, common shares outstanding at Dec. 31, 2012   18,937,107    
Equity, balance at Dec. 31, 2012 $ 85,566,487 $ 67,197,167 $ 18,499,154 $ (129,834)
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Net income (loss) attributable to common shareholders (2,104,614)   (2,104,614)  
Net loss at subsidiary attributable to noncontrolling interests (46,804)     (46,804)
Net income (loss) (2,151,418)      
Share-based compensation, shares   19,743    
Share-based compensation, amount 670,934 $ 670,934    
Exercise of options and related tax benefit, shares   36,758    
Exercise of options and related tax benefit 6,748 $ 6,748    
Repurchase of common shares, shares   (1,008,105)    
Repurchase of common shares (4,800,908) $ (4,800,908)    
Equity, common shares outstanding at Dec. 31, 2013   17,985,503    
Equity, balance at Dec. 31, 2013 79,291,843 $ 63,073,941 16,394,540 (176,638)
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Net income (loss) attributable to common shareholders 2,423,723   2,423,723  
Net loss at subsidiary attributable to noncontrolling interests (61,258)     (61,258)
Net income (loss) 2,362,465      
Share-based compensation, shares   15,300    
Share-based compensation, amount 760,894 $ 760,894    
Exercise of options and related tax benefit 1,653,028 1,653,028    
Sale of subsidiary shares to noncontrolling interest 1,000,005 $ 769,991   230,014
Repurchase of common shares, shares   (881,810)    
Repurchase of common shares $ (4,315,444) $ (4,315,444)    
Equity, common shares outstanding at Dec. 31, 2014 17,118,993 17,118,993    
Equity, balance at Dec. 31, 2014 $ 80,752,791 $ 61,942,410 18,818,263 (7,882)
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Net income (loss) attributable to common shareholders 731,351   731,351  
Net loss at subsidiary attributable to noncontrolling interests (60,243)     (60,243)
Net income (loss) 671,108      
Share-based compensation, shares   86,102    
Share-based compensation, amount 622,503 $ 622,503    
Exercise of options and related tax benefit, shares   3,409    
Exercise of options and related tax benefit 112,348 $ 112,348    
Repurchase of common shares, shares   (829,003)    
Repurchase of common shares $ (5,338,967) $ (5,338,967)    
Equity, common shares outstanding at Dec. 31, 2015 16,379,501 16,379,501    
Equity, balance at Dec. 31, 2015 $ 76,819,783 $ 57,338,294 $ 19,549,614 $ (68,125)