CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Cash dividends declared, per share	$ 0.44	$ 0.4	$ 0.4
Stock options exercised, shares	97,250	26,750	14,500
Treasury stock, shares	69,773	13,752	13,306
Common Stock [Member]
Stock options exercised, shares	97,250
Additional Paid-in Capital [Member]
Stock options exercised, shares	97,250	26,750	14,500
Treasury Stock [Member]
Stock options exercised, shares	97,250	26,750	14,500
Treasury stock, shares	69,773	13,752	13,306
Retained Earnings [Member]
Cash dividends declared, per share	$ 0.44	$ 0.4	$ 0.4