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Note 13 - Income Taxes (Details) - Reconciliation (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation [Abstract]      
Income taxes at the federal statutory rate $ 45,691us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 28,371us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 35,414us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State income taxes, net of federal benefit 3,398us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 2,259us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 2,753us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Tax effect of permanent differences 1,069us-gaap_IncomeTaxReconciliationOtherAdjustments 802us-gaap_IncomeTaxReconciliationOtherAdjustments 766us-gaap_IncomeTaxReconciliationOtherAdjustments
Other, net 428us-gaap_IncomeTaxReconciliationOtherReconcilingItems 412us-gaap_IncomeTaxReconciliationOtherReconcilingItems (205)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Provision for income taxes $ 50,586us-gaap_IncomeTaxExpenseBenefit $ 31,844us-gaap_IncomeTaxExpenseBenefit $ 38,728us-gaap_IncomeTaxExpenseBenefit