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Note 7 - Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2024
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

Number of

   

Weighted

 
   

Common Stock

   

Average

 
   

Equivalents

   

Exercise Price

 

Balance as of December 31, 2023

    141,889     $ 94.50  

Warrants for common stock sold

    2,467,104       3.10  

Warrants expired

    (141,889 )     94.50  

Balance as of September 30, 2024

    2,467,104     $ 3.10