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Note 3 - Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2015
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
As of March 31
,
 
 
 
2015
 
 
2014
 
                 
Stock options outstanding
    7,293       7,273  
Warrants outstanding
    3,843       3,825  
Common stock underlying convertible notes outstanding
    6,777       6,385