Quarterly report [Sections 13 or 15(d)]

Note 7 - Stockholders' Equity - Summary of Stock Option Activity (Details)

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Note 7 - Stockholders' Equity - Summary of Stock Option Activity (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Outstanding, options (in shares) 256,474  
Outstanding, weighted average exercise price (in dollars per share) $ 9.74  
Outstanding, remaining term (Year) 8 years 10 months 24 days 9 years 7 months 6 days
Outstanding, aggregate intrinsic value $ 0  
Outstanding, weighted average exercise price (in shares) 256,474 256,474
Outstanding, weighted average exercise price (in dollars per share) $ 9.74 $ 9.74
Expected to vest, options (in shares) 162,624  
Expected to vest, weighted average exercise price (in dollars per share) $ 5.84  
Expected to vest, remaining term (Year) 8 years 10 months 24 days  
Expected to vest, aggregate intrinsic value $ 0  
Exercisable, options (in shares) 93,850  
Exercisable, weighted average exercise price (in dollars per share) $ 16.48  
Exercisable, remaining term (Year) 8 years 9 months 18 days  
Exercisable, aggregate intrinsic value $ 0