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Note 13 - Income Taxes (Details) - Tax Rate Reconciliation (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Tax Rate Reconciliation [Abstract]
Federal tax provision at statutory rate	$ 73,673us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 58,026us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 44,723us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State taxes, net of federal income tax benefit	6,526us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	3,141us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	4,772us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Non-deductible expenses	3,188us-gaap_IncomeTaxReconciliationNondeductibleExpense	1,010us-gaap_IncomeTaxReconciliationNondeductibleExpense	618us-gaap_IncomeTaxReconciliationNondeductibleExpense
Permanent differences related to the employee stock purchase program	68us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	55us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost	52us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
Net change in valuation allowance	(4,121)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(554)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(1,200)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
General business credits	(4,002)us-gaap_IncomeTaxReconciliationTaxCredits	(440)us-gaap_IncomeTaxReconciliationTaxCredits
Other	(377)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	(664)us-gaap_IncomeTaxReconciliationOtherReconcilingItems	97us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Income tax provision	$ 74,955us-gaap_IncomeTaxExpenseBenefit	$ 60,574us-gaap_IncomeTaxExpenseBenefit	$ 49,062us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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