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Note 8 - Derivatives (Tables)
 6 Months Ended
Jun. 30, 2020
Notes Tables  
Schedule of Derivative Liabilities at Fair Value [Table Text Block]
Derivative liability balance at December 31, 2019   $
50,989
  
Derivative instrument recognized for A, B and Agent Warrants    
2,669,995
  
Derivative instrument related to Promissory Note 2020    
120,921
  
Gain recognized to revalue derivative instrument at fair value    
(27,107
 )
Derivative liability balance at March 30, 2020   $
2,814,798
  
Derivative instrument recognized for May 2020 Warrants    
1,324,184
  
Derivative instrument recognized for June 2020 Warrants    
1,749,721
  
Derivative instrument related to Promissory Note 2020    
20,542
  
Reclassification of Warrant liabilities to Equity on exercise    
(1,701,756
 )
Loss recognized to revalue derivative instrument at fair value    
422,081
  
Derivative liability balance at June 30, 2020   $
4,629,570