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Note 6 - Comprehensive Income - Components of Comprehensive Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2019 | Oct. 31, 2018 | Oct. 31, 2019 | Oct. 31, 2018
Change in unrealized gains (losses) on securities, amount before tax |  |  | $ 457 | $ 229
Change in unrealized gains (losses) on securities, tax expense |  |  | (95) | (48)
Change in unrealized gains (losses) on securities, amount net of tax |  |  | 362 | 181
Other comprehensive income (loss), available-for-sale securities adjustment, amount before tax |  |  | 457 | 229
Other comprehensive income (loss), available-for-sale securities, tax expense |  |  | (95) | (48)
Other comprehensive income (loss), available-for-sale securities adjustment, amount net of tax | $ 276 | $ (245) | $ 362 | $ 181

X
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