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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, 2018 | Jul. 31, 2017
Change in unrealized gains (losses) on securities, amount before tax | $ 539 | $ 142
Change in unrealized gains (losses) on securities, tax expense | (113) | (50)
Change in unrealized gains (losses) on securities, amount net of tax | 426 | 92
Other comprehensive income (loss), available-for-sale securities adjustment, amount before tax | 539 | 142
Other comprehensive income (loss), available-for-sale securities, tax expense | (113) | (50)
Other comprehensive income (loss), available-for-sale securities adjustment, amount net of tax | $ 426 | $ 92

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