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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
Jan. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share, Basic [Abstract]          
Numerator – net income   $ 4,269 $ 3,128 $ 7,883 $ 6,275
Denominator – weighted average common shares outstanding (in shares)   7,328,127 7,135,083 7,320,243 6,997,420
Basic net income per common share (in dollars per share)   $ 0.58 $ 0.44 $ 1.08 $ 0.90
Earnings Per Share, Diluted [Abstract]          
Effect of dilutive stock options (in shares) [1]   183,931 159,947 189,849 149,608
Effect of dilutive stock warrant (in shares) [2]   0 84,323 0 159,616
Weighted average common shares and common stock equivalents (in shares)   7,512,058 7,379,353 7,510,092 7,306,644
Diluted net income per common share (in dollars per share)   $ 0.57 $ 0.42 $ 1.05 $ 0.86
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)       58,063  
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 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 common share because their effect would have been anti-dilutive. For the three and six months ended March 31, 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.