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Unaudited Condensed Statement of Stockholders' Equity - 9 months ended Sep. 30, 2017 - USD ($)
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning balance at Dec. 31, 2016 $ 45,032,402 $ 928 $ 88,582,470     $ (43,550,996)
Beginning balance, shares at Dec. 31, 2016   9,275,062        
Stock-based compensation 463,856   463,856      
Exercise of stock options $ 506,704 $ 24 506,680      
Exercise of stock options, shares 244,993 244,993        
Shares issued pursuant to stock awards   $ 5 (5)      
Shares issued pursuant to stock awards, shares   57,475        
Common stock repurchases $ (468,823)     $ (468,823)    
Common stock repurchases, shares   (52,200)        
Reversal of costs related to secondary offering 781   781      
Unrealized loss on available-for-sale securities (1,696)       $ (1,696)  
Net income 549,323         549,323
Ending balance at Sep. 30, 2017 $ 46,082,547 $ 957 $ 89,553,782 $ (468,823) $ (1,696) $ (43,001,673)
Ending balance, shares at Sep. 30, 2017   9,525,330