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Note 9 - Income Taxes (Details) - Reconciliation of Income Tax Expense (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Reconciliation of Income Tax Expense [Abstract]    
Income tax expense $ 3,940us-gaap_IncomeTaxExpenseBenefit $ 859us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate 41.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations