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Note 9 - Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2024
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

March 31,

 
   

2024

   

2023

 
                 

Stock options to purchase common stock

    2,439,110       2,168,450  

Unvested restricted stock units

          2,734  

Common stock warrants

    3,134,917       2,424,724  

Total

    5,574,027       4,595,908