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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Cash dividends paid, per share	$ 0.58	$ 0.51	$ 0.47
Stock options exercised, shares	50,075	84,000	29,075
Treasury stock, shares			1,159
Common Stock [Member]
Stock options exercised, shares			29,075
Additional Paid-in Capital [Member]
Stock options exercised, shares	50,075	84,000	29,075
Treasury Stock [Member]
Stock options exercised, shares			29,075
Treasury stock, shares			1,159
Retained Earnings [Member]
Cash dividends paid, per share	$ 0.58	$ 0.51	$ 0.47

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Aggregate dividends paid during the period for each share of common stock outstanding.

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