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Note 7 - Embedded Derivatives (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Defined Benefit Plan, Assumptions [Table Text Block]
   
December 31,
   
December 31,
 
   
201
9
   
201
8
 
                 
Stock price
  $
2.31
    $
1.96
 
Conversion Rate
  $
67.95
    $
67.95
 
Conversion Price
  $
14.72
    $
14.72
 
Maturity date
   
March 15, 2020
     
March 15, 2020
 
Risk-free interest rate
   
1.52
%    
2.57
%
Estimated stock volatility
   
60
%    
150
%
Estimated credit spread
   
27
%    
31
%