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Note 3 - Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2014
Accounting Policies [Abstract]  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

As of September 30,

 
   

2014

   

2013

 
                 

Stock options outstanding

    6,456       6,270  

Warrants outstanding

    4,108       3,969  

Common stock underlying convertible notes outstanding

    6,578       6,198