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Note 15 - Stock-based Compensation Plans - Stock Option Activity (Details) - USD ($)
 12 Months Ended
Oct. 31, 2023
Oct. 31, 2022
Oct. 31, 2021
Stock options outstanding (in shares) 166,559    
Stock options outstanding, weighted average exercise price (in dollars per share) $ 48.02    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 0 0 0
Granted, weighted average exercise price (in dollars per share) $ 0    
Exercised (in shares) (4,363)    
Exercised, weighted average exercise price (in dollars per share) $ 31.14    
Forfeited (in shares) (250)    
Forfeited, weighted average exercise price (in dollars per share) $ 7.85    
Expired (in shares) (18,399)    
Expired, weighted average exercise price (in dollars per share) $ 157    
Stock options outstanding (in shares) 143,547 166,559  
Stock options outstanding, weighted average exercise price (in dollars per share) $ 34.63 $ 48.02  
Stock options outstanding, weighted average contractual life (Year) 4 years 4 months 24 days    
Stock options outstanding, intrinsic value $ 5,231,933    
Stock options exercisable at end of period (in shares) 132,903    
Stock options exercisable at end of period, weighted average exercise price (in dollars per share) $ 36.66    
Stock options exercisable, weighted average contractual life (Year) 4 years 3 months 18 days    
Stock options exercisable, intrinsic value $ 4,590,643