Quarterly report [Sections 13 or 15(d)]

Note 7 - Stock-Based Compensation - Performance Stock Performance (Details)

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Note 7 - Stock-Based Compensation - Performance Stock Performance (Details) - $ / shares
6 Months Ended 18 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2025
Forfeited or expired, weighted-average exercise price (in dollars per share) $ 34.65    
Weighted-average exercise price, outstanding (in dollars per share) $ 33.64   $ 33.64
Performance Stock Units [Member]      
Unvested shares, number of shares (in shares) 47,745    
Unvested shares, weighted average grant date fair value (in dollars per share) $ 26.18    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period 50,747 47,745  
Granted, weighted average grant date fair value (in dollars per share) $ 30.9 $ 26.18 $ 30.9
Vested, number of shares (in shares) 0    
Vested, weighted average grant date fair value (in dollars per share) $ 0    
Forfeited, number of shares (in shares) (47,745)    
Forfeited or expired, weighted-average exercise price (in dollars per share) $ 26.18    
Unvested, number of shares (in shares) 50,747   50,747
Weighted-average exercise price, outstanding (in dollars per share) $ 30.9   $ 30.9