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Note 9 - Warrants (Tables)
6 Months Ended
Jun. 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

  $0.37    530,381 

May 2022

  $0.68    45,823,528 

March 2021 - March 2025

 $13.00-$52.20   107,721 

September 2021 - September 2027

       46,461,630