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Note 10 - Income Taxes (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Income Tax Expense (Benefit) $ 21,364,000us-gaap_IncomeTaxExpenseBenefit $ 17,890,000us-gaap_IncomeTaxExpenseBenefit  
Effective Income Tax Rate Reconciliation, Percent 37.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 36.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Income Taxes Receivable     $ 18,100,000us-gaap_IncomeTaxReceivable