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Statements of Stockholders' Equity - USD ($)
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Total
Beginning Balance at Dec. 31, 2013 $ 4,867 $ 61,251,183 $ (61,122,674) $ 133,376
Beginning Balance (in shares) at Dec. 31, 2013 4,867,063      
Issuance of common stock $ 10 12,490   12,500
Issuance of common stock (in shares) 10,000      
Exercise of warrants $ 458 137,042   137,500
Exercise of warrants (in shares) 457,813      
Exercise of stock options $ 69 47,102   $ 47,171
Exercise of stock options (in shares) 68,975     (31,475)
Stock-based compensation   204,678   $ 204,678
Loss on extinguishment of debt   61,500   61,500
Net income     432,117 432,117
Ending Balance at Dec. 31, 2014 $ 5,404 61,713,995 (60,690,557) 1,028,842
Ending Balance (in shares) at Dec. 31, 2014 5,403,851      
Exercise of warrants $ 125 131,125   131,250
Exercise of warrants (in shares) 125,271      
Exercise of stock options $ 91 155,858   $ 155,949
Exercise of stock options (in shares) 91,333     (91,333)
Stock-based compensation   209,864   $ 209,864
Loss on extinguishment of debt      
Net income     1,817,672 $ 1,817,672
Ending Balance at Dec. 31, 2015 $ 5,620 $ 62,210,842 $ (58,872,885) $ 3,343,577
Ending Balance (in shares) at Dec. 31, 2015 5,620,455