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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, 2015 $ 5,620 $ 62,210,842 $ (58,872,885) $ 3,343,577
Beginning 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
Cost of tender offer      
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      
Exercise of stock options $ 160 331,563   $ 331,723
Exercise of stock options (in shares) 159,839     159,839
Stock-based compensation   426,950   $ 426,950
Cost of tender offer   (85,876)   (85,876)
Net effect of deferred revenue adjustment $ 602,320   602,320 602,320
Net income     (1,430,731) (1,430,731)
Ending Balance at Dec. 31, 2017 $ 7,011 $ 64,777,620 $ (47,554,208) $ 17,230,423
Ending Balance (in shares) at Dec. 31, 2017 7,011,128