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Unaudited Condensed Statement of Stockholders' Equity - 3 months ended Mar. 31, 2018 - USD ($)
Total
Common Stock
Additional Paid-in Capital
Treasury Stock
Accumulated Other Comprehensive Loss
Accumulated Deficit
Beginning balance at Dec. 31, 2017 $ 46,224,979 $ 961 $ 89,907,766 $ (1,257,100) $ (16,907) $ (42,409,741)
Beginning balance, shares at Dec. 31, 2017   9,481,992        
Stock-based compensation 358,896   358,896      
Exercise of stock options $ 103,705 $ 5 103,700      
Exercise of stock options, shares 52,970 52,970        
Common stock repurchases $ (779,913)     (779,913)    
Common stock repurchases, shares   (86,168)        
Unrealized loss on available-for-sale securities (4,136)       (4,136)  
Net loss (1,105,791)         (1,105,791)
Ending balance at Mar. 31, 2018 $ 44,797,740 $ 966 $ 90,370,362 $ (2,037,013) $ (21,043) $ (43,515,532)
Ending balance, shares at Mar. 31, 2018   9,448,794