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Statements of Stockholders' Equity - USD ($)
Common Stock
Additional Paid-In Capital
Retained Earnings / Accumulated Deficit
Total
Beginning Balance at Dec. 31, 2014 $ 5,404 $ 61,713,995 $ (60,690,557) $ 1,028,842
Beginning 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
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      
Exercise of warrants $ 146 157,999   158,145
Exercise of warrants (in shares) 146,095      
Exercise of stock options $ 112 178,400   $ 178,512
Exercise of stock options (in shares) 111,855     (111,855)
Stock-based compensation   342,610   $ 342,610
Net income     12,147,088 12,147,088
Ending Balance at Dec. 31, 2016 $ 5,878 $ 62,889,851 $ (46,725,797) $ 16,169,932
Ending Balance (in shares) at Dec. 31, 2016 5,878,405