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Note 7 - Stockholders' Equity and Common Stock Warrants (Tables)
9 Months Ended
Sep. 30, 2022
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Outstanding

  

Range of exercise

price per share

 

Expiration dates

Common stock warrants issued in 2018 related to the January 2018 Offering

  23,639  $599.71-$749.76 

January 2023

Common stock warrants issued related to the May 2019 Offering

  27,648  $250.09-$306.04 

May and December 2024

Common stock warrants issued related to the November 2019 Offering

  4,269   $17.51  

November 2024

Common stock warrants issued related to the December 2019 Offering

  6,264  $21.68-$34.92 

December 2024 and June 2025

Common stock warrants issued related to the May 2020 Offering

  11,424   $65.65  

March 2025

Common stock warrants issued related to May 2020 Investor Warrant Exercise

  4,998   $29.70  

November 2025

Common stock warrants issued related to the February 2021 Offering

  33,649   $64.08  

February 2026

   111,891