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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, 2023
Dec. 31, 2022
Earnings Per Share, Basic [Abstract]    
Numerator – net income $ 6,296 $ 7,507
Denominator – weighted average common shares outstanding (in shares) 8,114,209 8,232,273
Basic net income per common share (in dollars per share) $ 0.78 $ 0.91
Earnings Per Share, Diluted [Abstract]    
Effect of dilutive stock options (in shares) 51,839 86,460
Weighted average common shares and common stock equivalents (in shares) 8,166,048 8,318,733
Diluted net income per common share (in dollars per share) $ 0.77 $ 0.90
Stock Options    
Earnings Per Share, Diluted [Abstract]    
Antidilutive securities excluded from computation of earnings per share (in shares) 214,595 182,000