Note 8 - Concentrations of Credit Risk (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Cash, Uninsured Amount	$ 12.5		$ 12.5
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Distributors One [Member]
Concentration Risk, Percentage	11.00%	28.00%	11.00%	32.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Distributors Two [Member]
Concentration Risk, Percentage	17.00%		14.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Wireless Carrier One [Member]
Concentration Risk, Percentage		14.00%	11.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Wireless Carrier [Member]
Concentration Risk, Percentage				10.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributors One [Member]
Concentration Risk, Percentage			14.00%	18.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributors Two [Member]
Concentration Risk, Percentage			19.00%	15.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Wireless Carrier One [Member]
Concentration Risk, Percentage				10.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Wireless Carrier Two [Member]
Concentration Risk, Percentage				21.00%