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Note 6 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $)
Apr. 30, 2014
Apr. 30, 2013
Deferred tax assets    
Accrued liabilities $ 11,878,000 $ 9,916,000
Deferred compensation 6,272,000 6,050,000
Equity compensation 3,598,000 916,000
Unrecognized tax benefits 3,113,000 3,128,000
State net operating losses and tax credits 2,892,000 3,902,000
Other 124,000 100,000
Total gross deferred tax assets 27,877,000 24,012,000
Less valuation allowance (91,000) 0
Total net deferred tax assets 27,786,000 24,012,000
Deferred tax liabilities    
Property and equipment depreciation (318,565,000) (295,951,000)
Goodwill (14,989,000) (11,919,000)
Other (307,000) 66,000
Total gross deferred tax liabilities (333,861,000) (307,804,000)
Net deferred tax liability $ (306,075,000) $ (283,792,000)