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Condensed Consolidated Statement of Equity - USD ($)
Total
Common stock
Retained earnings
Noncontrolling interests
Balance, Beginning of Period at Dec. 31, 2017 $ 63,921,601 $ 52,410,941 $ 11,709,222 $ (198,562)
Balance, Beginning of Period (in shares) at Dec. 31, 2017   15,723,075    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Proceeds from sales of common stock, net of offering costs 200,909 $ 200,909    
Proceeds from the sale of common stock, net of offering costs (in shares)   30,704    
Share-based compensation 339,209 $ 339,209    
Share-based compensation (in shares)   145,550    
Repurchase of common shares (1,195,225) $ (1,195,225)    
Repurchase of shares (in shares)   (172,079)    
Net income (loss) (2,392,189)   (2,379,239) (12,950)
Balance, End of Period at Mar. 31, 2018 60,874,305 $ 51,755,834 9,329,983 (211,512)
Balance, End of Period (in shares) at Mar. 31, 2018   15,727,250    
Balance, Beginning of Period at Dec. 31, 2017 63,921,601 $ 52,410,941 11,709,222 (198,562)
Balance, Beginning of Period (in shares) at Dec. 31, 2017   15,723,075    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Repurchase of subsidiary shares from noncontrolling interest 0      
Repurchase of common shares   $ (2,000,000.0)    
Repurchase of shares (in shares)   (299,370)    
Net income (loss) (3,137,639)      
Balance, End of Period at Jun. 30, 2018 59,670,450 $ 51,297,429 8,609,295 (236,274)
Balance, End of Period (in shares) at Jun. 30, 2018   15,604,709    
Balance, Beginning of Period at Mar. 31, 2018 60,874,305 $ 51,755,834 9,329,983 (211,512)
Balance, Beginning of Period (in shares) at Mar. 31, 2018   15,727,250    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Proceeds from sales of common stock, net of offering costs 0 $ 0    
Proceeds from the sale of common stock, net of offering costs (in shares)   0    
Share-based compensation 326,100 $ 326,100    
Share-based compensation (in shares)   4,750    
Repurchase of common shares (784,505) $ (784,505)    
Repurchase of shares (in shares)   (127,291)    
Net income (loss) (745,450)   (720,688) (24,762)
Balance, End of Period at Jun. 30, 2018 59,670,450 $ 51,297,429 8,609,295 (236,274)
Balance, End of Period (in shares) at Jun. 30, 2018   15,604,709    
Balance, Beginning of Period at Dec. 31, 2018 $ 55,570,501 $ 51,098,613 4,746,154 (274,266)
Balance, Beginning of Period (in shares) at Dec. 31, 2018 15,481,497 15,481,497    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share-based compensation $ 364,434 $ 364,434    
Share-based compensation (in shares)   187,486    
Repurchase of common shares (703,790) $ (703,790)    
Repurchase of shares (in shares)   (121,466)    
Net income (loss) (40,418)   (73,878) 33,460
Balance, End of Period at Mar. 31, 2019 55,190,727 $ 50,759,257 4,672,276 (240,806)
Balance, End of Period (in shares) at Mar. 31, 2019   15,547,517    
Balance, Beginning of Period at Dec. 31, 2018 $ 55,570,501 $ 51,098,613 4,746,154 (274,266)
Balance, Beginning of Period (in shares) at Dec. 31, 2018 15,481,497 15,481,497    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Repurchase of subsidiary shares from noncontrolling interest $ 800,000      
Repurchase of common shares   $ (1,200,000)    
Repurchase of shares (in shares)   (205,913)    
Net income (loss) (607,230)      
Balance, End of Period at Jun. 30, 2019 $ 53,688,717 $ 49,938,254 4,122,769 (372,306)
Balance, End of Period (in shares) at Jun. 30, 2019 15,471,070 15,471,070    
Balance, Beginning of Period at Mar. 31, 2019 $ 55,190,727 $ 50,759,257 4,672,276 (240,806)
Balance, Beginning of Period (in shares) at Mar. 31, 2019   15,547,517    
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Share-based compensation 396,548 $ 396,548    
Share-based compensation (in shares)   8,000    
Repurchase of subsidiary shares from noncontrolling interest (800,000) $ (685,805)   (114,195)
Repurchase of common shares (531,746) $ (531,746)    
Repurchase of shares (in shares)   (84,447)    
Net income (loss) (566,812)   (549,507) (17,305)
Balance, End of Period at Jun. 30, 2019 $ 53,688,717 $ 49,938,254 $ 4,122,769 $ (372,306)
Balance, End of Period (in shares) at Jun. 30, 2019 15,471,070 15,471,070