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Note 6 - Comprehensive Income - Components of Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2024 | Oct. 31, 2023 | Jul. 31, 2023 | Jan. 31, 2023 | Oct. 31, 2022 | Jul. 31, 2022 | Jan. 31, 2024 | Jan. 31, 2023
Change in unrealized gains/(losses) on available-for-sale fixed income securities |  |  |  |  |  |  | $ (508) | $ 158
Change in unrealized gains/(losses) on available-for-sale fixed income securities |  |  |  |  |  |  | 106 | (33)
Change in unrealized gains/(losses) on available-for-sale fixed income securities |  |  |  |  |  |  | (402) | 125
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent |  |  |  |  |  |  | (508) | 158
Other comprehensive income (loss), available-for-sale securities, tax expense |  |  |  |  |  |  | 106 | (33)
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | $ 258 | $ (448) | $ (212) | $ 123 | $ (3) | $ 5 | $ (402) | $ 125

X
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