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Note 9 - Net Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2025
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

March 31,

 
   

2025

   

2024

 
                 

Stock options to purchase common stock

    168,184       162,607  

Common stock warrants

    2,467,104       208,994  

Total

    2,635,288       371,601