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Note 9 - Warrants (Tables)
9 Months Ended
Sep. 30, 2020
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Range of Exercise Prices

  

Number of Warrants Outstanding

  

Range of Expiration Dates

 $0.35    567,660  

May 2022

 $0.68    45,823,528  

March 2021 - March 2025

$13.00

-$52.20   107,721  

September 2021 - September 2027

      46,498,909