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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($)
Total
Common Stock
Treasury Stock
Additional paid-in capital
Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2016   38,930,738 (6,548,473)    
Beginning balance at Dec. 31, 2016 $ 57,690,183 $ 38,931 $ (10,401,906) $ 93,257,472 $ (25,204,314)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation $ 643,430     643,430  
Exercise of stock options (in shares) 6,250 6,250      
Exercise of stock options $ 1,437 $ 6   1,431  
Repurchases of common stock (in shares)     (4,060,704)    
Repurchases of common stock (6,223,967)   $ (6,223,967)    
Net loss $ (2,135,819)       (2,135,819)
Ending balance (in shares) at Dec. 31, 2017 38,936,988 38,936,988 (10,609,177)    
Ending balance at Dec. 31, 2017 $ 49,975,264 $ 38,937 $ (16,625,873) 93,913,557 (27,351,357)
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock-based compensation $ 467,203     467,203  
Exercise of stock options (in shares) 30,000 30,000      
Exercise of stock options $ 4,500 $ 30   4,470  
Repurchases of common stock (in shares)     (1,644,325)    
Repurchases of common stock (2,304,042)   $ (2,304,042)    
Net loss $ (5,691,756)       (5,691,756)
Ending balance (in shares) at Dec. 31, 2018 38,966,988 38,966,988 (12,253,502)    
Ending balance at Dec. 31, 2018 $ 42,451,169 $ 38,967 $ (18,929,915) $ 94,385,230 $ (33,043,113)