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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
Jan. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Earnings Per Share, Basic [Abstract]          
Numerator – net income   $ 4,416 $ 4,277 $ 12,299 $ 10,552
Denominator – weighted average common shares outstanding (in shares)   7,345,618 7,269,564 7,328,702 7,088,134
Basic net income per common share (in dollars per share)   $ 0.60 $ 0.59 $ 1.68 $ 1.49
Earnings Per Share, Diluted [Abstract]          
Effect of dilutive stock options (in shares) [1]   189,539 162,607 189,745 153,941
Effect of dilutive stock warrant (in shares) [2]   0 0 0 106,411
Weighted average common shares and common stock equivalents (in shares)   7,535,157 7,432,171 7,518,447 7,348,486
Diluted net income per common share (in dollars per share)   $ 0.59 $ 0.58 $ 1.64 $ 1.44
Shares issued for warrants exercised 370,899        
Proceeds from warrants exercised $ 2,500        
Stock Options          
Earnings Per Share, Diluted [Abstract]          
Antidilutive securities excluded from computation of earnings per share (in shares)       38,709  
Warrant          
Earnings Per Share, Diluted [Abstract]          
Antidilutive securities excluded from computation of earnings per share (in shares)       370,899  
Number of Shares          
Earnings Per Share, Diluted [Abstract]          
Class of warrant, exercise price (in dollars per share)   $ 6.73   $ 6.73  
[1] 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 common share because their effect would have been anti-dilutive. For the three and nine months ended June 30, 2017, all outstanding options were included in the computation of diluted net income per share.
[2] Represented a warrant to purchase 370,899 shares of the Company's common stock at an exercise price of $6.73 per share (subject to anti-dilution adjustments) at any time through December 23, 2018 (the "Warrant"). On January 31, 2017, the Warrant was exercised and 370,899 shares of the Company's common stock were issued in exchange for $2.50 million.