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Note 6 - Comprehensive Income - Components of Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
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