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Note 6 - Comprehensive Income - Components of Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Change in unrealized gains (losses) on securities, amount before tax	$ 946	$ 109
Change in unrealized gains (losses) on securities, tax expense	(247)	(23)
Change in unrealized gains (losses) on securities, amount net of tax	699	86
Less: Gains realized in net income	(783)
Less: Gains realized in net income, tax	204
Less: Gains realized in net income, net of tax	(579)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent, Total	163	109
Other Comprehensive Income (Loss), Available-for-sale Securities, Tax, Portion Attributable to Parent, Total	(43)	(23)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent, Total	$ 120	$ 86

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Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss.

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