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Share-Based Compensation -Fair Value of 2009 stock option plan and Restricted Stock Units (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Share-based compensation |  |  |
Share-based compensation expense | $ 200,000 | $ 203,000 | $ 251,000
RSU |  |  |
Share-based compensation |  |  |
Restricted stock units outstanding ( in shares) | 0 | 0 | 0
2009 Plan |  |  |
Share-based compensation |  |  |
Share-based compensation expense | $ 0 | $ 0 | $ 68,000
2009 Plan | Non-employee director |  |  |
Share-based compensation |  |  |
Share-based compensation expense | $ 200,000 | $ 203,000 | $ 178,000
2009 Plan | RSU | Non-employee director |  |  |
Share-based compensation |  |  |
Restricted stock units outstanding ( in shares) | 0 | 0 | 67,115
2009 Plan | RSU | Director |  |  |
Share-based compensation |  |  |
Shares settled in pro rata basis | 1 |  |

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- Definition Shares used to settle in pro rata basis. + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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