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Note 3 - Basis of Presentation and Summary of Significant 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]
 
 
March 31,
 
 
 
2016
 
 
2015
 
Convertible debt
    2,110,400       58,383,144  
Common stock warrants
    4,776,875        
Stock options
    17,963,599       10,578,483  
Unvested restricted stock awards
    138,070        
      24,988,944       68,961,627