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Stock Compensation Plans: Disclosure of Share-based Compensation Arrangements by Share-based Payment Award (Details) - $ / shares
 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Shares:    
Options outstanding, beginning of period (shares) 369,150 421,925
Exercised (shares) (29,900) (26,055)
Granted (shares) 0 1,000
Forfeited (shares) (10,140) (4,600)
Options outstanding, end of period (shares) 329,110 392,270
Weighted Average Exercise Price (in dollars per share):    
Options outstanding, beginning of period (dollars per share) $ 24.00 $ 23.30
Exercised (dollars per share) 13.03 19.88
Granted (dollars per share) 0 33.40
Forfeited (dollars per share) 25.71 27.38
Options outstanding, end of period (dollars per share) $ 24.95 $ 23.50