Note 13 - Commitments and Contingencies (Details Textual) - USD ($)	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019
Litigation Settlement, Expense	$ 682,000	$ 3,008,000
Pending Litigation [Member] \| Professional Fees [Member]
Legal Fees	2,623,000	2,052,000
Accounts Payable and Accrued Liabilities [Member] \| Pending Litigation [Member]
Loss Contingency Accrual, Ending Balance	$ 920,000	$ 1,817,000

The amount of expense provided in the period for legal costs incurred on or before the balance sheet date pertaining to resolved, pending or threatened litigation, including arbitration and mediation proceedings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.3)
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

Name:	us-gaap_LegalFees
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration