Note 21 - Leases - Components of Lease Expense (Details) - USD ($)	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Operating lease cost:	$ 5,258,000
Amortization of finance lease assets	77,000
Interest on finance lease liabilities	10,000
Total finance lease cost	87,000
Sublease income:	345,000
Operating cash flows from finance leases (interest)	10,000
Operating cash flows from operating leases (lease payments reflected in the change in accounts payable, accrued expenses and other liabilities in the statement of cash flows)	4,006,000
Financing cash flows from finance leases (principal payments)	236,000	$ 223,000
Operating lease assets obtained in exchange for lease liabilities	$ 1,574,000
Operating Leases (in years) (Year)	7 years 102 days
Operating Leases	5.50%