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Note 3 - Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2015
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
As of September 30,
 
 
 
2015
 
 
2014
 
                 
Stock options outstanding
    6,960       6,456  
Warrants outstanding
    3,565       4,108  
Common stock underlying convertible notes outstanding
    6,982       6,578