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Note 13 - Warrants (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Warrant Activity [Table Text Block]
Warrants
  
Number of
Warrants
Issued
    
Weighted
Average
Exercise Price
  
                 
Warrants outstanding at December 31, 2016
    
1,487,958
     $
9.39
  
Warrants issued during the
nine months ended September 30, 2017 (see Note 10)
    
6,679,378
      
3.08
  
Warrants exercised during the
nine months ended September 30, 2017 (see Note 10)
    
(2,638,702
)
    
1.92
  
                 
Warrants outstanding at
September 30, 2017
    
5,528,634
     $
5.33
  
                 
Aggregate intrinsic value of outstanding warrants at
September 30, 2017
  
─
          
                 
Weighted average remaining contractual terms at
September 30, 2017 (in years)
    
3.16