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Note 9 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2024
Notes Tables  
Schedule of Common Stock Reserved for Issuance [Table Text Block]
  

June 30, 2024

  

December 31, 2023

 
         

Options issued and outstanding

  21,699,803   17,938,726 

RSUs issued and outstanding

  3,135,958   2,126,373 

2019 Equity Incentive Plan available for future grant

  16,621,469   5,685,806 

2024 Inducement Award Plan available for future grant

  1,727,500    

Common stock warrants

  140,596   227,434 

2022 Employee Stock Purchase Plan

  2,362,902   1,065,325 

Total

  45,688,228   27,043,664 
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Securities into which warrants are convertible

 

Warrants Outstanding

  

Exercise Price

 

Expiration Date

          

Common Stock

  29,150  $2.50 

March 2025

Common Stock

  100,532  $3.125 

February 2025

Common Stock

  10,914  $22.99 

December 2026

Total

  140,596