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Consolidated Statements of Equity - USD ($)
Total
Common stock
Retained earnings
Noncontrolling interest
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    
Exercise of options and related tax benefit 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    
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 $ (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)
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Net income (loss) attributable to common shareholders (944,683)   (944,683)  
Net loss at subsidiary attributable to noncontrolling interests (59,255)     (59,255)
Net income (loss) (1,003,938)      
Share-based compensation, shares   223,987    
Share-based compensation, amount 852,102 $ 852,102    
Exercise of options and related tax benefit (1,026,413) $ (1,026,413)    
Repurchase of common shares, shares   (529,312)    
Repurchase of common shares $ (2,520,715)   (2,520,715)  
Equity, common shares outstanding at Dec. 31, 2016 16,074,176 16,074,176    
Equity, balance at Dec. 31, 2016 $ 73,120,819 $ 54,643,268 $ 18,604,931 $ (127,380)