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Note 3 - Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
As of March 31,
 
 
 
2016
 
 
2015
 
                 
Stock options outstanding
    8,961       7,293  
Warrants outstanding
    3,565       3,843  
Common stock underlying convertible notes outstanding
    7,193       6,777