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Stock Compensation Plans: Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) - $ / shares
 9 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Shares:    
Options outstanding, beginning of period (shares) 369,150 421,925
Exercised (shares) (30,200) (27,055)
Granted (shares) 0 1,000
Forfeited (shares) (16,560) (7,800)
Options outstanding, end of period (shares) 322,390 388,070
Weighted Average Exercise Price (in dollars per share):    
Options outstanding, beginning of period (dollars per share) $ 24.00 $ 23.30
Exercised (dollars per share) 13.07 19.77
Granted (dollars per share) 0 33.40
Forfeited (dollars per share) 26.98 28.23
Options outstanding, end of period (dollars per share) $ 24.87 $ 23.47