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Note 7 - Stockholders' Equity (Tables)
6 Months Ended
Jun. 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

    67,104       6.60  

Balance as of June 30, 2024

    208,993     $ 66.30