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Note 10 - Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate Reconciliation, Percent 39.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 37.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 38.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Deferred Tax Assets, Net of Valuation Allowance $ 29,800,000us-gaap_DeferredTaxAssetsNet    
Deferred Tax Liabilities, Gross 22,489,000us-gaap_DeferredIncomeTaxLiabilities 19,613,000us-gaap_DeferredIncomeTaxLiabilities  
Deferred Tax Assets, Valuation Allowance $ 0us-gaap_DeferredTaxAssetsValuationAllowance $ 0us-gaap_DeferredTaxAssetsValuationAllowance