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Note 3 - Concentrations of Credit Risk (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 10 Months Ended
--- | --- | --- | ---
Jul. 31, 2023 | Apr. 30, 2022 | Jan. 31, 2022 | Apr. 30, 2023 | Apr. 30, 2022 | Jul. 31, 2023
Cash, Uninsured Amount | $ 2.9 |  |  |  |  | $ 2.9
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | Wireless Carrier [Member] |  |  |  |  |  |
Concentration Risk, Percentage | 12.00% |  |  |  |  |
Revenue from Contract with Customer Benchmark [Member] | Customer Concentration Risk [Member] | One Distributor [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  | 16.00% |  | 23.00% |  | 13.00%
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Wireless Carrier [Member] |  |  |  |  |  |
Concentration Risk, Percentage | 12.00% | 19.00% |  |  | 19.00% |
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Distributor One [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 4.00% |  |  |

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