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Note 6 - Stockholders' Equity (Tables)
6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Notes Tables    
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]

Issue Date

 

Number

of Shares

   

Exercise

Price

 

Expiration

June 2020

    4,000     $ 1.68  

June 2025

September 2020

    159,781       75.00  

September 2025

February 2021

    4,800       103.13  

August 2024

September 2021

    6,668       195.00  

September 2026

December 2023

    582,000       1.68  

June 2029

May 2024

    1,605,688       1.68  

May 2029

Outstanding at June 30, 2024

    2,362,937            

Issue Date

 

Number

of Shares

   

Exercise

Price

   

Expiration

 

June 2020

    8,000     $ 6.21    

June 2025

 

September 2020

    159,781       75.00    

September 2025

 

September 2020

    8,534       82.50    

March 2024

 

February 2021

    4,800       103.13    

August 2024

 

September 2021

    6,668       195.00    

September 2026

 

December 2023

    507,032       -0-     -  

December 2023

    1,408,998       6.21    

June 2029

 

Outstanding at December 31, 2022

    2,103,813