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Note 3 - Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2025
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
   

December 31,

 
   

2025

   

2024

 

Common stock warrants

    2,598,337       2,609,289  

Stock options

    992,701       636,802  
      3,591,038       3,246,091