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Note 2 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2014
Accounting Policies [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

As of December 31,

 
   

2014

   

2013

   

2012

 
                         

Stock options outstanding

    7,918       6,356       4,324  

Warrants outstanding

    4,108       3,969       4,219  

Common stock underlying Convertible Notes outstanding

    6,677       6,291       5,927