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Note 8 - Warrants to Purchase Common Stock (Tables)
9 Months Ended
Sep. 30, 2014
Note 8 - Warrants To Purchase Common Stock Tables  
Summary of warrants issued, exercised and expired

A summary of warrants issued, exercised and expired for the nine months ended September 30, 2014 follows:  

 

    Shares     Weighted- Average Exercise Price ($)     Weighted-Average Remaining Contractual Term  
Outstanding at December 31, 2013     10,486,066     $ 0.98       0.83  
Granted     4,434,343       0.40       4.73  
Exercised                  
Expired     (61,397 )     3.00        
                         
Outstanding at September 30, 2014     14,859,012     $ 0.80       1.84  
                         
Exercisable at September 30, 2014     14,859,012     $ 0.80       1.84