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Note 8 - Warrants to Purchase Common Stock (Tables)
6 Months Ended
Jun. 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 six months ended June 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 1,596,361   0.60   4.73
Exercised    
Expired (17,900)   3.00  
           
Outstanding at June 30 2014 12,064,527   $0.93   1.37
           
Exercisable at June 30, 2014 12,064,527   $0.93   1.37