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Note 7 - Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2014
Note 7 - Stock-Based Compensation Tables  
Summary of options issued, exercised and cancelled

A summary of options issued, exercised and cancelled for the six months ended June 30, 2014 are as follows:

 

    Shares   Weighted-Average
Exercise Price ($)
Weighted-Average
Remaining Contractual
Term
Aggregate
Intrinsic
Value ($)

Outstanding at December 31, 2013

  8,315,958   $0.42 9.09
Granted   1,264,000   0.26 9.61
Exercised    
Cancelled    (2,359,233)   0.50
               

Outstanding at June 30, 2014

  7,220,725   $0.36 8.60
             

Exercisable at June 30, 2014

  5,750,346   $0.39 8.79