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Note 7 - Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

Number of

   

Weighted

 
   

Common Stock

   

Average

 
   

Warrants

   

Exercise Price

 

Balance as of December 31, 2023

    2,128,429     $ 6.30  

Warrants for common stock sold

    1,006,488       0.44  

Balance as of March 31, 2024

    3,134,917     $ 4.42