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Note 5 - Stockholders' Equity (Tables)
3 Months Ended 12 Months Ended
Mar. 31, 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

    8,000     $ 6.21    

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

    238,000       -0-     n/a  

December 2023

    1,408,998       6.21    

June 2029

 

Outstanding at March 31, 2024

    1,826,247                

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