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Note 3 - Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
As of June 30,
 
 
 
2016
 
 
2015
 
                 
Stock options outstanding
    8,747       6,985  
Warrants outstanding
    600       3,649  
Common stock underlying convertible notes outstanding
    7,301       6,879