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Note 7 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified | Apr. 30, 2014 | Apr. 30, 2013
--- | --- | ---
Deferred tax assets |  |
Accrued liabilities | $ 23,292 | $ 16,066
Deferred compensation | 6,272 | 6,050
Equity compensation | 3,598 | 916
Unrecognized tax benefits | 3,113 | 3,128
State net operating losses and tax credits | 2,757 | 3,902
Other | 98 | 100
Total gross deferred tax assets | 39,130 | 30,162
Total net deferred tax assets | 39,130 | 30,162
Deferred tax liabilities |  |
Property and equipment depreciation | (318,565) | (295,951)
Goodwill | (14,989) | (11,919)
Other | (307) | 66
Total gross deferred tax liabilities | (333,861) | (307,804)
Net deferred tax liability | $ (294,731) | $ (277,642)

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