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Consolidated Statements of Equity - USD ($)
Total
Common stock
Retained earnings
Noncontrolling interest
Equity, balance at Dec. 31, 2016 $ 73,120,819 $ 54,643,268 $ 18,604,931 $ (127,380)
Equity, common shares outstanding at Dec. 31, 2016   16,074,176    
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)      
Repurchase of subsidiary shares to noncontrolling interest 0      
Share-based compensation, amount 1,115,063 $ 1,115,063    
Share-based compensation, shares   146,275    
Exercise of options and related tax benefit 372,500 $ 372,500    
Exercise of options and related tax benefit, shares   50,000    
Repurchase of common shares (3,719,890) $ (3,719,890)    
Repurchase of common shares, shares   (547,376)    
Equity, balance at Dec. 31, 2017 63,921,601 $ 52,410,941 11,709,222 (198,562)
Equity, common shares outstanding at Dec. 31, 2017   15,723,075    
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Net income (loss) attributable to common shareholders (6,963,068)   (6,963,068)  
Net loss at subsidiary attributable to noncontrolling interests (75,704)     (75,704)
Net income (loss) (7,038,772)      
Repurchase of subsidiary shares to noncontrolling interest 0      
Share-based compensation, amount 1,364,698 $ 1,364,698    
Share-based compensation, shares   170,759    
Proceeds from sale of common stock, net of offering costs 200,909 $ 200,909    
Proceeds from the sale of common stock, net of offering costs, shares   30,704    
Repurchase of common shares (2,877,935) $ (2,877,935)    
Repurchase of common shares, shares   (443,041)    
Equity, balance at Dec. 31, 2018 $ 55,570,501 $ 51,098,613 4,746,154 (274,266)
Equity, common shares outstanding at Dec. 31, 2018 15,481,497 15,481,497    
Increase (Decrease) in Shareholders' Equity [Roll Forward]        
Net income (loss) attributable to common shareholders $ (3,537,759)   (3,537,759)  
Net loss at subsidiary attributable to noncontrolling interests (8,752)     (8,752)
Net income (loss) (3,546,511)      
Repurchase of subsidiary shares to noncontrolling interest (800,000) $ (685,805)   (114,195)
Sale of subsidiary shares to noncontrolling interest 1,000,000 640,407   359,593
Vesting of common stock 862,200 $ 862,200    
Vesting of common stock, shares   180,000    
Share-based compensation, amount 1,485,898 $ 1,485,898    
Share-based compensation, shares   225,536    
Repurchase of common shares (3,486,835) $ (3,486,835)    
Repurchase of common shares, shares   (623,478)    
Equity, balance at Dec. 31, 2019 $ 51,085,253 $ 49,914,478 $ 1,208,395 $ (37,620)
Equity, common shares outstanding at Dec. 31, 2019 15,263,555 15,263,555