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Note 16 - Concentration (Details Textual) - USD ($) | 12 Months Ended
--- | ---
Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Revenue from Contract with Customer, Including Assessed Tax | $ 39,695,000 | $ 40,525,000 | $ 40,392,000
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Single Customer [Member] |  |  |
Concentration Risk, Percentage | 33.90% | 33.00% | 31.60%
Revenue from Contract with Customer, Including Assessed Tax | $ 39,695,000 | $ 40,525,000 | $ 40,392,000

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