Note 9 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2021	Apr. 30, 2020	Oct. 31, 2020
Operating lease cost	$ 2,594	$ 2,625	$ 5,210	$ 5,216
Cash payments on lease liabilities	$ 2,390	$ 2,308	$ 4,688	$ 4,624
Weighted-average remaining lease term (in years) (Year)	3 years		3 years		3 years 6 months
Weighted-average discount rate (incremental borrowing rate)	9.50%		9.50%		9.60%
Prepaid Expenses and Other Current Assets [Member]
ROU assets	$ 18,959		$ 18,959		$ 20,016
Accounts Payable and Accrued Liabilities [Member]
Lease liabilities	$ 19,970		$ 19,970		$ 21,049