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Note 11 - Comprehensive Income - Components of Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2023 | Apr. 30, 2022 | Apr. 30, 2021
Change in unrealized gains on available-for-sale fixed income securities | $ 503 | $ (34) | $ (173)
Change in unrealized gains on available-for-sale fixed income securities | (105) | 7 | 45
Change in unrealized gains on available-for-sale fixed income securities | 398 | (27) | (128)
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent | 503 | (34) | (173)
Other comprehensive income (loss), available-for-sale securities, tax expense | (105) | 7 | 45
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | $ 398 | $ (27) | $ (128)

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