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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2020 | Apr. 30, 2019 | Apr. 30, 2018
Consolidated Statements of Comprehensive Income |  |  |
Unrealized gain on investments, net of deferred tax expense | $ 14 | $ 51 | $ 25

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