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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share, Basic [Abstract]          
Numerator – net income   $ 4,277 $ 2,547 $ 10,552 $ 7,455
Denominator – weighted average common shares outstanding (in shares)   7,269,564 6,822,608 7,088,134 6,846,373
Basic net income per common share (in dollars per share)   $ 0.59 $ 0.37 $ 1.49 $ 1.09
Earnings Per Share, Diluted [Abstract]          
Effect of dilutive stock options (in shares) [1]   162,607 93,041 153,941 69,291
Effect of dilutive stock warrant (in shares) [2]   0 195,550 106,411 175,997
Weighted average common shares and common stock equivalents (in shares)   7,432,171 7,111,199 7,348,486 7,091,661
Diluted net income per common share (in dollars per share)   $ 0.58 $ 0.36 $ 1.44 $ 1.05
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)     56,358    
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 nine months ended June 30, 2017 all outstanding options were included in the computation of diluted net income per share. For the nine months ended June 30, 2016, average options to purchase 56,358 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.