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Note 2 - Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
  

Six Months Ended June 30,

 
  

2025

  

2024

 

Common stock warrants

  208,406    

Common stock options

  13,511,482   11,596,762 

Total

  13,719,888   11,596,762