Quarterly report [Sections 13 or 15(d)]

Note 7 - Stock-based Compensation - Restricted Stock Transactions (Details)

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Note 7 - Stock-based Compensation - Restricted Stock Transactions (Details) - $ / shares
 6 Months Ended 12 Months Ended
Mar. 31, 2026
Sep. 30, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Settled in Period   33,834
Forfeited, weighted average grant date fair value (in dollars per share) $ 36.62  
Unvested, number of shares (in shares) 50,747  
Weighted-average exercise price, outstanding (in dollars per share) $ 51.01 $ 41.3
Restricted Stock [Member]    
Unvested shares, number of shares (in shares) 202,185  
Unvested shares, weighted average grant date fair value (in dollars per share) $ 27.64  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period 168,978  
Granted, weighted average grant date fair value (in dollars per share) $ 29.58  
Vested, number of shares (in shares) (96,811)  
Vested, weighted average grant date fair value (in dollars per share) $ 46.89  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Settled in Period 33,834  
Settled, weighted average grant date fair value (in dollars per share) $ 30.9  
Forfeited, number of shares (in shares) (11,780)  
Forfeited, weighted average grant date fair value (in dollars per share) $ 29.69  
Unvested, number of shares (in shares) 296,406 202,185
Weighted-average exercise price, outstanding (in dollars per share) $ 22.81