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Income Tax Expense (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Current:
Federal	$ 4,253	$ 4,103	$ 5,335
State	686	847	685
Current Income Tax Expense (Benefit), Total	4,939	4,950	6,020
Deferred:
Federal	557	131	(85)
State	70	33	(7)
Deferred Income Tax Expense (Benefit), Net of Valuation Allowance, Total	627	164	(92)
Income tax expense	$ 5,566	$ 5,114	$ 5,928

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred state and local tax expense (benefit) pertaining to income (loss) from continuing operations.