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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% |  |

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