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Note 4 - Stock Based Compensation - Stock Option Activity (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Outstanding, option (in shares) 510,119  
Outstanding, weighted average exercise price (in dollars per share) $ 10.45  
Outstanding, weighted average remaining contractual term (Year) 6 years 4 months 24 days 6 years 8 months 12 days
Outstanding, aggregate intrinsic value $ 0 $ 0
Granted, option (in shares) 0  
Forfeited, option (in shares) (1,500)  
Forfeited, weighted average exercise price (in dollars per share) $ 10.45  
Outstanding, option (in shares) 508,619 510,119
Outstanding, weighted average exercise price (in dollars per share) $ 10.45 $ 10.45
Options exercisable (in shares) 305,172  
Options exercisable, aggregate intrinsic value $ 0