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Note 6 - Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Tax Disclosure [Abstract]        
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate      
Income Taxes Paid $ 19,400,000us-gaap_IncomeTaxesPaid $ 13,200,000us-gaap_IncomeTaxesPaid $ 12,000,000us-gaap_IncomeTaxesPaid  
Deferred Tax Assets, Valuation Allowance 336,000us-gaap_DeferredTaxAssetsValuationAllowance 162,000us-gaap_DeferredTaxAssetsValuationAllowance    
Unrecognized Tax Benefits 576,000us-gaap_UnrecognizedTaxBenefits 516,000us-gaap_UnrecognizedTaxBenefits 421,000us-gaap_UnrecognizedTaxBenefits 1,423,000us-gaap_UnrecognizedTaxBenefits
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 452,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate      
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit 55,000us-gaap_SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit      
Tax Credit Carryforward, Amount 545,000us-gaap_TaxCreditCarryforwardAmount 343,000us-gaap_TaxCreditCarryforwardAmount    
Income Tax Examination, Penalties and Interest Accrued $ 99,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued $ 85,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued $ 91,000us-gaap_IncomeTaxExaminationPenaltiesAndInterestAccrued