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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, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share, Basic [Abstract]        
Numerator – net income $ 6,114 $ 4,269 $ 11,729 $ 7,883
Denominator – weighted average common shares outstanding (in shares) 8,310,074 7,328,127 8,301,550 7,320,243
Basic net income per common share (in dollars per share) $ 0.74 $ 0.58 $ 1.41 $ 1.08
Earnings Per Share, Diluted [Abstract]        
Effect of dilutive stock options (in shares) [1] 154,576 183,931 159,588 189,849
Weighted average common shares and common stock equivalents (in shares) 8,464,650 7,512,058 8,461,138 7,510,092
Diluted net income per common share (in dollars per share) $ 0.72 $ 0.57 $ 1.39 $ 1.05
Stock Options        
Earnings Per Share, Diluted [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 102,150 58,000 102,504 58,063
[1] For the three and six months ended March 31, 2018, average options to purchase 58,000 and 58,063 shares of common stock, respectively, were outstanding but not included in the computation of diluted net income per share because their effect would have been anti-dilutive.