Note 12 - Commitments - Other Information Related to Leases (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Apr. 30, 2021	Oct. 31, 2020
Right of use assets obtained in exchange for lease obligations operating leases	$ 976	$ 1,421
Weighted Average Remaining Lease Term, Operating leases (months) (Month)	19 months 25 days	22 months 28 days
Weighted Average Discount Rate, Operating leases	3.54%	3.54%