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Unaudited Condensed Statement of Stockholders' Equity - 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        
Common stock repurchases (779,913)     (779,913)    
Common stock repurchases, shares   (86,168)        
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes (4,136)       (4,136)  
Net income (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        
Beginning balance at Dec. 31, 2018 45,147,332 $ 995 93,583,069 (3,431,530) (11,141) (44,994,061)
Beginning balance, shares at Dec. 31, 2018   9,601,134        
Stock-based compensation 514,266   514,266      
Exercise of stock options $ 230,879 $ 8 230,871      
Exercise of stock options, shares 77,994 77,994        
Common stock repurchases $ (193,278)     (193,278)    
Common stock repurchases, shares   (14,350)        
Unrealized gain (loss) on available-for-sale securities, net of deferred taxes 10,128       10,128  
Net income 336,443         336,443
Ending balance at Mar. 31, 2019 $ 46,045,770 $ 1,003 $ 94,328,206 $ (3,624,808) $ (1,013) $ (44,657,618)
Ending balance, shares at Mar. 31, 2019   9,664,778