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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, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Earnings Per Share, Basic [Abstract]        
Numerator – net income $ 5,327 $ 7,251 $ 10,812 $ 14,541
Denominator – weighted average common shares outstanding (in shares) 8,337,407 8,331,121 8,346,839 8,322,210
Basic net income per common share (in dollars per share) $ 0.64 $ 0.87 $ 1.30 $ 1.75
Earnings Per Share, Diluted [Abstract]        
Effect of dilutive stock options (in shares) [1] 84,468 113,677 88,697 106,385
Weighted average common shares and common stock equivalents (in shares) 8,421,875 8,444,798 8,435,536 8,428,595
Diluted net income per common share (in dollars per share) $ 0.63 $ 0.86 $ 1.28 $ 1.73
Stock Options        
Earnings Per Share, Diluted [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 204,398 135,590 207,256 136,631
[1] For the three and six months ended March 31, 2021, average options to purchase 135,590 and 136,631 shares of common stock, respectively, were outstanding but not included in the computation of diluted net income per common share, because their effect would have been anti-dilutive.