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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, 2019 | Jul. 31, 2018
Change in unrealized gains (losses) on securities, amount before tax | $ 109 | $ 539
Change in unrealized gains (losses) on securities, tax expense | (23) | (113)
Change in unrealized gains (losses) on securities, amount net of tax | 86 | 426
Other comprehensive income (loss), available-for-sale securities adjustment, amount before tax | 109 | 539
Other comprehensive income (loss), available-for-sale securities, tax expense | (23) | (113)
Other comprehensive income (loss), available-for-sale securities adjustment, amount net of tax | $ 86 | $ 426

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