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Note 6 - Comprehensive Income - Components of Comprehensive Income (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2023 | Jul. 31, 2023 | Oct. 31, 2022 | Jul. 31, 2022 | Oct. 31, 2023 | Oct. 31, 2022
Change in unrealized gains/(losses) on available-for-sale fixed income securities |  |  |  |  | $ (837,000) | $ 3,000
Change in unrealized gains/(losses) on available-for-sale fixed income securities |  |  |  |  | 177,000 | (1,000)
Change in unrealized gains/(losses) on available-for-sale fixed income securities |  |  |  |  | (660,000) | 2,000
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, before Tax, Portion Attributable to Parent |  |  |  |  | (837,000) | 3,000
Other comprehensive income (loss), available-for-sale securities, tax expense |  |  |  |  | 177,000 | (1,000)
Other Comprehensive Income (Loss), Available-for-Sale Securities Adjustment, Net of Tax, Portion Attributable to Parent | $ (448,000) | $ (212,000) | $ (3,000) | $ 5,000 | $ (660,000) | $ 2,000

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