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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share, Basic [Abstract]        
Numerator – net income $ 5,956 $ 4,416 $ 17,685 $ 12,299
Denominator – weighted average common shares outstanding (in shares) 8,338,637 7,345,618 8,313,913 7,328,702
Basic net income per common share (in dollars per share) $ 0.71 $ 0.60 $ 2.13 $ 1.68
Earnings Per Share, Diluted [Abstract]        
Effect of dilutive stock options (in shares) [1] 143,723 189,539 154,299 189,745
Weighted average common shares and common stock equivalents (in shares) 8,482,360 7,535,157 8,468,212 7,518,447
Diluted net income per common share (in dollars per share) $ 0.70 $ 0.59 $ 2.09 $ 1.64
Stock Options        
Earnings Per Share, Diluted [Abstract]        
Antidilutive securities excluded from computation of earnings per share (in shares) 102,050   102,353 38,709
[1] For the three months ended June 30, 2018, there were no options to purchase shares of common stock that were omitted from the computation of diluted earnings per share because their effect would be anti-dilutive. For the nine months ended June 30, 2018, average options to purchase 38,709 shares of common stock were outstanding but not included in the computation of diluted net income per share because their effect would have been anti-dilutive.