Note 8 - Concentrations of Credit Risk (Details Textual) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2021 USD ($)	Apr. 30, 2020	Apr. 30, 2021 USD ($)	Apr. 30, 2020
Cash, Uninsured Amount	$ 13.4		$ 13.4
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member]
Number of Customers	2	2	2	3
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Two Distributors [Member]
Number of Customers	2	2	2	2
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Distributor One [Member]
Concentration Risk, Percentage	12.00%	17.00%	14.00%	14.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Distributor Two [Member]
Concentration Risk, Percentage	11.00%	11.00%	11.00%	11.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Wireless Carrier [Member]
Number of Customers				1
Concentration Risk, Percentage				11.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Distributors [Member]
Number of Customers	2	2	2	2
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor One [Member]
Concentration Risk, Percentage			14.00%	19.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor Two [Member]
Concentration Risk, Percentage			13.00%	14.00%