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Note 7 - Embedded Derivatives (Tables)
 12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Assumptions Used [Table Text Block]
   
December 31,
    
December 31,,
  
   
2018
    
2017
  
Stock price
   $
1.96
     $
11.80
  
Conversion Rate
    
67.95
      
1,358.90
  
Conversion Price
   $
14.72
     $
14.72
  
Maturity date
  
 
March 15, 2020
    
 
March 15, 2020
  
Risk-free interest rate
    
2.57
%
    
1.89
%
Estimated stock volatility
    
150
%
    
75
%
Estimated credit spread
    
31
%
    
28
%