Annual report [Section 13 and 15(d), not S-K Item 405]

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
12 Months Ended
Jan. 01, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Outstanding, options (in shares) 22,474 256,474 22,474  
Outstanding, weighted average exercise price (in dollars per share) $ 85.5 $ 9.74 $ 85.5  
Outstanding, remaining term (Year) 9 years 7 months 13 days 8 years 7 months 13 days 9 years 6 months  
Outstanding, aggregate intrinsic value   $ 0 $ 0 $ 0
Granted, options (in shares)     234,000  
Granted, weighted average exercise price (in dollars per share)     $ 2.46  
Granted, remaining term (Year)     10 years  
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)   162,624    
Expected to vest, weighted average exercise price (in dollars per share)   $ 5.84    
Expected to vest, remaining term (Year)   8 years 8 months 4 days    
Expected to vest, aggregate intrinsic value   $ 0    
Vested and Exercisable as of December 31, 2025 (in shares)   93,850    
Vested and Exercisable, weighted average exercise price (in dollars per share)   $ 16.48    
Vested and Exercisable, remaining term (Year)   8 years 6 months 7 days    
Vested and Exercisable, aggregate intrinsic value   $ 0