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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, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share, Basic [Abstract]          
Numerator – net income   $ 3,128 $ 2,380 $ 6,275 $ 4,908
Denominator – weighted average common shares outstanding (in shares)   7,135,083 6,846,527 6,997,420 6,858,190
Basic net income per common share (in dollars per share)   $ 0.44 $ 0.35 $ 0.90 $ 0.72
Earnings Per Share, Diluted [Abstract]          
Effect of dilutive stock options (in shares) [1]   159,947 62,028 149,608 57,482
Effect of dilutive stock warrant (in shares) [2]   84,323 171,450 159,616 166,273
Weighted average common shares and common stock equivalents (in shares)   7,379,353 7,080,005 7,306,644 7,081,945
Diluted net income per common share (in dollars per share)   $ 0.42 $ 0.34 $ 0.86 $ 0.69
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)     14,000   84,383
Warrant          
Earnings Per Share, Diluted [Abstract]          
Antidilutive securities excluded from computation of earnings per share (in shares)       370,899  
Common Stock          
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, 2017 all outstanding options were included in the computation of diluted net income per share. For the three and six months ended March 31, 2016, average options to purchase 14,000 and 84,383 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.
[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"). The Warrant was granted on December 23, 2008 to the U.S. Treasury Department ("Treasury") as part of the Company's participation in the Treasury's Troubled Asset Relief Program ("TARP"). On June 12, 2013, the Treasury sold the Warrant to private investors. 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.