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Note 3 - Basis of Presentation and Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
 
 
September 30,
 
 
 
2016
 
 
2015
 
Convertible debt
    749,280       5,847,645  
Common stock warrants
    460,721        
Stock options
    2,010,409       1,109,605  
Unvested restricted stock awards
    10,738       18,410  
      3,231,148       6,975,660