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Stock Compensation Plans: Activity Related to Restricted Stock (Details) - $ / shares
3 Months Ended 6 Months Ended
Mar. 31, 2025
Mar. 31, 2025
Mar. 31, 2024
Number of Unvested Shares      
Outstanding, period start (in shares)   49,015 26,150
Forfeited (in shares) (1,830)   0
Shares vested (in shares)   (200) 0
Outstanding, period end (in shares) 46,985 46,985  
Weighted Average Grant Date Fair Value      
Outstanding, period start (in dollars per share)   $ 29.28 $ 27.37
Forfeited (in dollars per share) $ 28.70   0
Vested (in dollars per share)   27.37 $ 0
Outstanding, period end (in dollars per share) $ 29.31 $ 29.31