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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, 2021
Dec. 31, 2020
Earnings Per Share, Basic [Abstract]    
Numerator – net income $ 5,485 $ 7,290
Denominator – weighted average common shares outstanding (in shares) 8,356,066 8,313,493
Basic net income per common share (in dollars per share) $ 0.66 $ 0.88
Earnings Per Share, Diluted [Abstract]    
Effect of dilutive stock options (in shares) [1] 92,834 99,251
Weighted average common shares and common stock equivalents (in shares) 8,448,900 8,412,744
Diluted net income per common share (in dollars per share) $ 0.65 $ 0.87
Stock Options    
Earnings Per Share, Diluted [Abstract]    
Antidilutive securities excluded from computation of earnings per share (in shares) 210,052 137,650
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