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

Note 10 - Equity Incentive Plan - Summary of Stock Option Activity and Related Information (Details)

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Note 10 - Equity Incentive Plan - Summary of Stock Option Activity and Related Information (Details) - $ / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Outstanding, options (in shares) 509,414    
Exercisable, options (in shares) 497,414    
Equity Incentive Plan [Member]      
Outstanding, options (in shares) 525,948 513,948  
Outstanding, options, exercise price (in dollars per share) $ 7.69 $ 7.59  
Outstanding, options, remaining life (Year) 4 years 7 months 6 days 5 years 8 months 12 days 6 years 7 months 6 days
Granted, options (in shares) 0 12,000  
Granted, options, exercise price (in dollars per share) $ 0 $ 11.96  
Exercised, options (in shares) (8,334) 0  
Exercised, options, exercise price (in dollars per share) $ 10.41 $ 0  
Forfeited / Expired, options (in shares) (8,200) 0  
Forfeited / Expired, options, exercise price (in dollars per share) $ 12.95 $ 0  
Outstanding, options (in shares) 509,414 525,948 513,948
Outstanding, options, exercise price (in dollars per share) $ 7.56 $ 7.69 $ 7.59
Exercisable, options (in shares) 497,414 475,287  
Exercisable, options, exercise price (in dollars per share) $ 7.44 $ 7.18  
Exercisable, options, remaining life (Year) 4 years 6 months 5 years 4 months 24 days