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Statements of Stockholders' Equity - USD ($)
Total
Common Stock
Additional paid-in capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive (Loss)
Balance at Dec. 31, 2015 $ 10,613,820 $ 326,115 $ 10,150,190 $ 638,672 $ (450,901) $ (50,256)
Balance, Shares at Dec. 31, 2015   3,261,148     206,114  
Net income (loss) 508,448     508,448    
Other comprehensive income, net of taxes 26,354         26,354
Private placement of common stock, net of offering costs 3,160,923 $ 65,988 3,094,935      
Private placement of common stock, net of offering costs, Shares   659,880        
Public offering of common stock, net of offering costs 5,313,223 $ 112,381 5,200,842      
Public offering of common stock, net of offering costs, Shares   1,123,810        
Exercise of stock options 31,975   13,017   $ 18,958  
Exercise of stock options, Shares         (8,666)  
Stock-based compensation 67,399   67,399      
Balance at Dec. 31, 2016 19,722,142 $ 504,484 18,526,383 1,147,120 $ (431,943) (23,902)
Balance, Shares at Dec. 31, 2016   5,044,838     197,448  
Net income (loss) (168,147)     (168,147)    
Other comprehensive income, net of taxes 23,264         23,264
Private placement of common stock, net of offering costs 1,034,164 $ 20,000 1,014,164      
Private placement of common stock, net of offering costs, Shares   200,000        
Public offering of common stock, net of offering costs 2,734,174 $ 41,781 2,692,393      
Public offering of common stock, net of offering costs, Shares   417,807        
Exercise of stock options 49,560   25,496   $ 24,064  
Exercise of stock options, Shares         (11,000)  
Stock-based compensation 199,783   199,783      
Balance at Dec. 31, 2017 $ 23,594,940 $ 566,265 $ 22,458,219 $ 978,973 $ (407,879) $ (638)
Balance, Shares at Dec. 31, 2017   5,662,645     186,448