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Note I - Stock-based Compensation - Options Exercised (Details) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Options exercised (in shares)	162,250	35,250
Cash received from option exercises	$ 3,259	$ 543
Intrinsic value of options exercised	$ 5,508	$ 784

X

- Definition

Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Number of share options (or share units) exercised during the current period.

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