Summary of Significant Accounting Policies - Anti-dilutive shares (Details) - shares	12 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Restricted stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Non-vested restricted stock awards shares were excluded from the diluted loss per share calculation	136,000	201,000
Stock option
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Non-vested restricted stock awards shares were excluded from the diluted loss per share calculation		1,000

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration