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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.

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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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