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Note 6 - Income Taxes (Details) - Components of Income Tax Expense Attributable to Earnings (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2014	Apr. 30, 2013	Apr. 30, 2012
Components of Income Tax Expense Attributable to Earnings [Abstract]
Federal	$ 44,078	$ 23,519	$ 9,937
State	5,657	4,455	2,345
	49,735	27,974	12,282
Deferred tax expense	22,283	36,530	54,442
Total income tax provision	$ 72,018	$ 64,504	$ 66,724

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 income tax expense (benefit) pertaining to income (loss) from continuing operations.