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Note 11 - Stockholders' Equity (Deficit) and Common Stock Warrants (Tables)
12 Months Ended
Dec. 31, 2023
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
   

Warrants

   

Exercise

   
   

Outstanding

   

Price

 

Expiration Date

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  

April 2028

Pre-funded warrants issued related to closing of reverse recapitalization

    495,995     $0.001  

None

      598,457