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Note 9 - Stockholders' Equity and Common Stock Warrants (10-Q) (Tables)
3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
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            
   

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