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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, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share, Basic [Abstract]        
Numerator – net income $ 7,251 $ 5,049 $ 14,541 $ 11,701
Denominator – weighted average common shares outstanding (in shares) 8,331,121 8,344,201 8,322,210 8,342,828
Basic net income per common share (in dollars per share) $ 0.87 $ 0.61 $ 1.75 $ 1.40
Earnings Per Share, Diluted [Abstract]        
Effect of dilutive stock options (in shares) [1] 113,677 112,458 106,385 123,066
Weighted average common shares and common stock equivalents (in shares) 8,444,798 8,456,659 8,428,595 8,465,894
Diluted net income per common share (in dollars per share) $ 0.86 $ 0.60 $ 1.73 $ 1.38
Stock Options        
Earnings Per Share, Diluted [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 135,590 138,362 136,631 121,497
[1] For the three and six months ended March 31, 2020, average options to purchase 138,362 and 121,497 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.