Note 3 - Concentrations of Credit Risk (Details Textual) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jan. 31, 2023	Apr. 30, 2022	Jan. 31, 2022	Apr. 30, 2023	Apr. 30, 2022
Cash, Uninsured Amount	$ 3.1
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Wireless Carrier [Member]
Concentration Risk, Percentage	20.00%
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | One Distributor [Member]
Concentration Risk, Percentage		24.00%	18.00%	28.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Wireless Carrier [Member]
Concentration Risk, Percentage	24.00%	21.00%			21.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor One [Member]
Concentration Risk, Percentage			24.00%