Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Stock-based Compensation - Option Transaction Summary (Details)

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Note 7 - Stock-based Compensation - Option Transaction Summary (Details) - $ / shares
6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Outstanding as of September 30, 2022 (in shares) 236,509  
Outstanding as of September 30, 2022 (in dollars per share) $ 31.30  
Granted (in shares) 19,084 62,730
Granted (in dollars per share) $ 95.06 $ 66.48
Exercised (in shares) (18,709)  
Exercised (in dollars per share) $ 27.24  
Forfeited or Expired (in shares) 0  
Forfeited or Expired (in dollars per share) $ 0  
Outstanding as of March 31, 2023 (in shares) 236,884  
Outstanding as of March 31, 2023 (in dollars per share) $ 36.76