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Note 5 - Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Common Stock Reserved for Future Issuance [Table Text Block]
   

Shares

 

Stock warrants outstanding

    2,103,814  

Stock options outstanding

    134,609  

Stock options authorized for future grants

    200,000  

Total

    2,438,423  
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, 2022

    137,276     $ 28.35       9.2     $ -0-  

Granted

    -       -                  

Exercised

    -       -                  

Forfeited or expired

    (2,667 )     22.82                  

Outstanding at December 31, 2023

    134,609     $ 28.41       8.2     $ -  

Exercisable at December 31, 2023

    97,184     $ 32.35       7.9     $ -  
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

 

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