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Net Income Per Common Share: Schedule of Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Earnings Per Share, Basic [Abstract]    
Numerator – net income $ 6,860 $ 6,296
Denominator – weighted average common shares outstanding (in shares) 7,958,275 8,114,209
Basic net income per common share (in dollars per share) $ 0.86 $ 0.78
Earnings Per Share, Diluted [Abstract]    
Effect of dilutive stock options (in shares) 41,229 51,839
Weighted average common shares and common stock equivalents (in shares) 7,999,504 8,166,048
Diluted net income per common share (in dollars per share) $ 0.86 $ 0.77
Stock Options    
Earnings Per Share, Diluted [Abstract]    
Antidilutive securities excluded from computation of earnings per share (in shares) 96,220 214,595