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 ($)
$ / shares in Units, $ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Mar. 31, 2026
Outstanding, options (in shares) 256,474    
Outstanding, weighted average exercise price (in dollars per share) $ 9.74    
Outstanding, remaining term (Year) 8 years 1 month 6 days 8 years 7 months 6 days  
Outstanding, aggregate intrinsic value $ 0 $ 0  
Outstanding, options (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) 81,950    
Expected to vest, weighted average exercise price (in dollars per share) $ 6.46    
Expected to vest, remaining term (Year) 8 years 2 months 12 days    
Expected to vest, aggregate intrinsic value $ 0    
Exercisable, options (in shares)     174,524
Exercisable, weighted average exercise price (in dollars per share) $ 11.27    
Exercisable, remaining term (Year) 8 years 1 month 6 days    
Exercisable, aggregate intrinsic value $ 0