Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Stock-based Compensation - Option Transaction Summary (Details)

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Note 4 - Stock-based Compensation - Option Transaction Summary (Details) - $ / shares
9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Options, outstanding (in shares) 337,100  
Weighted-average exercise price, outstanding (in dollars per share) $ 12.48  
Granted (in shares) 105,089 121,350
Weighted-average exercise price, Granted (in dollars per share) $ 23.74 $ 12.43
Exercised (in shares) (101,800)  
Weighted-average exercise price, Exercised (in dollars per share) $ 12.47  
Forfeited or Expired (in shares) (38,709)  
Weighted-average exercise price, Forfeited or Expired (in dollars per share) $ 13.68  
Options, outstanding (in shares) 301,680  
Weighted-average exercise price, outstanding (in dollars per share) $ 16.25