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Note 9 - Net Loss Per Share (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

September 30,

 
   

2025

   

2024

 
                 

Stock options to purchase common stock

    164,900       153,290  

Common stock warrants

    7,948,618       2,467,104  

Total

    8,113,518       2,620,394