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Note 6 - Comprehensive Income - Components of Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 31, 2023 | Jul. 31, 2022
Change in unrealized gains on available-for-sale fixed income securities | $ (270) | $ 7
Change in unrealized gains on available-for-sale fixed income securities | 58 | (2)
Change in unrealized gains on available-for-sale fixed income securities | (212) | 5
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent | (270) | 7
Other comprehensive income (loss), available-for-sale securities, tax expense | 58 | (2)
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | $ (212) | $ 5

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