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Note 14 - Concentration (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2023 | Oct. 31, 2022
Revenue from Contract with Customer, Including Assessed Tax | $ 9,610,000 | $ 10,066,000 | $ 19,353,000 | $ 20,010,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Single Customer [Member] |  |  |  |
Concentration Risk, Percentage |  |  | 33.60% |
Revenue from Contract with Customer, Including Assessed Tax |  |  | $ 19,353,000 |

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