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Net Income Per Common Share: Schedule of Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Earnings Per Share, Basic [Abstract] |  |  |  |
Numerator – net income |  |  | $ 3,614 | $ 3,147
Denominator – weighted average common shares outstanding (in shares) |  |  | 7,312,531 | 6,862,749
Basic net income per common share (in dollars per share) |  |  | $ 0.49 | $ 0.46
Earnings Per Share, Diluted [Abstract] |  |  |  |
Effect of dilutive stock options (in shares) | [1] |  | 195,638 | 139,493
Effect of dilutive stock warrant (in shares) | [2] |  | 0 | 233,273
Weighted average common shares and common stock equivalents (in shares) |  |  | 7,508,169 | 7,235,515
Diluted net income per common share (in dollars per share) |  |  | $ 0.48 | $ 0.43
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) |  |  | 14,651 |
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 |
[1] | For the three months ended December 31, 2017, average options to purchase 14,651 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 months ended December 31, 2016, 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"). 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.

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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