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Consolidated Statements of Equity - USD ($)
Total
Common stock
Retained earnings
Noncontrolling interest
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, shares   (829,003)    
Repurchase of common shares (5,338,967) $ (5,338,967)    
Equity, common shares outstanding at Dec. 31, 2015   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, shares   3,409    
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)
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Cumulative effect from change in accounting principle (Note 12) 1,082,924   1,082,924  
Net income (loss) attributable to common shareholders $ (1,274,446)      
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)
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Net income (loss) attributable to common shareholders (7,978,633)   (7,978,633)  
Net loss at subsidiary attributable to noncontrolling interests (71,182)     (71,182)
Net income (loss) (8,049,815)      
Share-based compensation, shares   146,275    
Share-based compensation, amount 1,115,063 $ 1,115,063    
Charitable contribution of shares, shares   50,000    
Charitable contribution of shares 372,500 $ 372,500    
Repurchase of common shares, shares   (547,376)    
Repurchase of common shares $ (3,719,890)   (3,719,890)  
Equity, common shares outstanding at Dec. 31, 2017 15,723,075 15,723,075    
Equity, balance at Dec. 31, 2017 $ 63,921,601 $ 52,410,941 $ 11,709,222 $ (198,562)