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Note 9 - Net Loss Per Share (Tables)
6 Months Ended
Jun. 30, 2024
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

June 30,

 
   

2024

   

2023

 
                 

Stock options to purchase common stock

    155,642       173,738  

Common stock warrants

    208,993       161,648  

Total

    364,635       335,386