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Note 10 - Employee Benefits - Non-vested Option Awards Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Granted, shares (in shares) 28,000    
Granted, weighted average grant date fair value (in dollars per share) $ 5.26 $ 6.63 $ 5.79
Forfeited, shares (in shares) (61,900)    
Service Based Options [Member]      
Beginning of period, nonvested, shares (in shares)   406,300  
Beginning of period, nonvested, weighted average grant date fair value (in dollars per share)   $ 4.88  
Nonvested, weighted average remaining contractual life (Year) 4 years 4 months 24 days 5 years  
Granted, shares (in shares) 28,000    
Granted, weighted average grant date fair value (in dollars per share) $ 5.26    
Granted, weighted average remaining contractual life (Year) 6 years 7 months 6 days    
Vested, shares (in shares) (128,300)    
Vested, weighted average grant date fair value (in dollars per share) $ 4.67    
Vested, weighted average remaining contractual life (Year) 3 years 7 months 6 days    
Forfeited, shares (in shares) (43,500)    
Forfeited, weighted average grant date fair value (in dollars per share) $ 4.57    
Forfeited, weighted average remaining contractual life (Year) 4 years 2 months 12 days    
End of period, nonvested, shares (in shares) 262,500   406,300
End of period, nonvested, weighted average grant date fair value (in dollars per share) $ 5.07   $ 4.88