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Note 5 - Income Taxes (Details) - Federal Income Tax Reconciled to the Effective Income Tax Rate
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Federal Income Tax Reconciled to the Effective Income Tax Rate [Abstract]      
Statutory federal income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Per diem and other non-deductible expenses 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 4.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 5.00%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
Increase in taxes arising from state income taxes, net of federal income tax benefit 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 3.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes  
Effective tax rate 42.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 42.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations