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Note 7 - Stockholders' Equity (Deficit) - Option Activity (Details) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Outstanding (in shares) 56 2,505 2,505  
Outstanding, weighted average exercise price (in dollars per share) $ 5,342 $ 2,000 $ 2,000  
Outstanding, weighted average fair value $ 2,874 $ 1,080 $ 1,080  
Outstanding, weighted average remaining contractual term (Year)   1 year 5 months 26 days 1 year 2 months 23 days 1 year 5 months 26 days
Granted (in shares) 0 0    
Granted, weighted average exercise price (in dollars per share) $ 0 $ 0    
Exercised (in shares) 0 0    
Exercised, weighted average exercise price (in dollars per share) $ 0 $ 0    
Expired/Forfeited (in shares) (56) (2,440)    
Expired/Forfeited, weighted average exercise price (in dollars per share) $ 5,342 $ 1,921    
Expired/Forfeited, weighted average fair value $ 2,874 $ 1,044    
Outstanding (in shares) 0 65 56 2,505
Outstanding, weighted average exercise price (in dollars per share) $ 0 $ 6,038 $ 5,342 $ 2,000
Outstanding, weighted average fair value $ 0 $ 3,246 $ 2,874 $ 1,080
Exercisable (in shares) 0 65    
Exercisable, weighted average exercise price (in dollars per share) $ 0 $ 6,038    
Exercisable, weighted average fair value $ 0 $ 3,246    
Outstanding, aggregate intrinsic value       $ 2,294
Exercisable, weighted average remaining contractual term (Year)   1 year 5 months 26 days