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Net Income Per Common Share: Schedule of Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share, Basic [Abstract]        
Numerator – net income $ 7,024 $ 6,211 $ 21,565 $ 17,912
Denominator – weighted average common shares outstanding (in shares) 8,365,350 8,309,947 8,336,590 8,331,908
Basic net income per common share (in dollars per share) $ 0.84 $ 0.75 $ 2.59 $ 2.15
Earnings Per Share, Diluted [Abstract]        
Effect of dilutive stock options (in shares) [1] 100,043 69,036 104,271 105,122
Weighted average common shares and common stock equivalents (in shares) 8,465,393 8,378,983 8,440,861 8,437,030
Diluted net income per common share (in dollars per share) $ 0.83 $ 0.74 $ 2.55 $ 2.12
Stock Options        
Earnings Per Share, Diluted [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 134,365 135,212 135,876 126,052
[1] For the three and nine months ended June 30, 2020, average options to purchase 135,212 and 126,052 shares of common stock, respectively, were outstanding but not included in the computation of diluted net income per shares, because their effect would have been anti-dilutive.