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Net Income Per Common Share: Schedule of Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share, Basic [Abstract]        
Numerator – net income $ 5,708 $ 6,663 $ 12,004 $ 14,169
Denominator – weighted average common shares outstanding (in shares) 8,081,924 8,220,532 8,098,155 8,226,467
Basic net income per common share (in dollars per share) $ 0.71 $ 0.81 $ 1.48 $ 1.72
Earnings Per Share, Diluted [Abstract]        
Effect of dilutive stock options (in shares) 39,185 83,838 45,546 85,163
Weighted average common shares and common stock equivalents (in shares) 8,121,109 8,304,370 8,143,701 8,311,630
Diluted net income per common share (in dollars per share) $ 0.70 $ 0.80 $ 1.47 $ 1.70
Stock Options        
Earnings Per Share, Diluted [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 244,030 176,867 229,232 177,484