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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, 2025 | Jul. 31, 2024
Change in unrealized gains on available-for-sale fixed income securities, amount before tax | $ 18 | $ 224
Change in unrealized gains on available-for-sale fixed income securities, tax (expense) benefit | (3) | (47)
Change in unrealized gains on available-for-sale fixed income securities, net of tax | 15 | 177
Other comprehensive income (loss), available-for-sale securities, amount before tax | 18 | 224
Other comprehensive income (loss), available-for-sale securities, tax (expense) benefit | (3) | (47)
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | $ 15 | $ 177

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