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Note 9 - Stockholders' Equity and Common Stock Warrants (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

Outstanding

   

Range of exercise

price per share

 

Expiration dates

Historical Diffusion common stock warrants

    58,844    

$26.27 - $459.06

 

May 2024 through February 2026

Historical EIP common stock warrants

    43,618     $ 19.81  

4/1/2028

      102,462