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Note 5 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2025
Notes Tables  
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
   

Number

of Shares

   

Weighted-

Average

Exercise

Price

   

Weighted-

Average

Remaining

Contractual

Term (yrs)

   

Aggregate

Intrinsic

Value

 

Outstanding at December 31, 2024

    333,648     $ 12.71       8.6     $ 58,500  

Stock options granted

    805,300       2.48                  

Outstanding at March 31, 2025

    1,138,948     $ 5.48       9.4     $ -  

Exercisable at March 31, 2025

    117,905     $ 30.67       6.8     $ -  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

Common Warrants

                 
   

Number

of Shares

   

Weighted-

Average

Exercise

Price

   

Weighted-

Average

Remaining

Contractual

Term (yrs)

   

Pre-Funded

Warrants

Number

of Shares

   

Total

Warrants

 

Outstanding at December 31, 2024

    6,617,747     $ 5.13       4.6       -       6,617,747  

Warrants issued

    3,435,115       1.31               2,085,115       5,520,230  

Outstanding at March 31, 2025

    10,052,862     $ 2.61       4.8       -       12,137,977  

Issue Date

 

Number

of Shares

   

Exercise

Price

   

Expiration

 

September 2020

    159,781     $ 75.00    

September 2025

 

September 2021

    6,668       195.00    

September 2026

 

May 2024

    1,605,688       1.31    

May 2029

 

July 2024

    2,170,000       1.31    

January 2030

 

August 2024

    2,675,610       1.31    

March 2030

 

March 2025

    2,085,115       0.0001      n/a  

March 2025

    3,435,115       1.31    

June 2030

 

Outstanding at March 31, 2025

    12,137,977