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Note 2 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
As of
December 31
,
 
 
 
2015
 
 
2014
 
 
2013
 
                         
Stock options outstanding
    8,435       7,918       6,356  
Warrants outstanding
    3,565       4,108       3,969  
Common stock underlying Convertible Notes outstanding
    7,087       6,677       6,291