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

Nine Months Ended

September 30,

 
  

2025

  

2024

 

Common stock warrants

  205,953   5,857,680 

Common stock options

  13,303,744   12,327,332 

Total

  13,509,697   18,185,012