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Note 11 - Federal and State Income Taxes (Details) - Income Tax Rate Reconciliation (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Rate Reconciliation [Abstract]
Income tax at the statutory federal rate									$ 7,552us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 3,288us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 1,222us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Income tax at the statutory federal rate									34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Nondeductible expenses									154us-gaap_IncomeTaxReconciliationNondeductibleExpense	127us-gaap_IncomeTaxReconciliationNondeductibleExpense	138us-gaap_IncomeTaxReconciliationNondeductibleExpense
Nondeductible expenses									0.70%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense	1.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense	3.80%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
State income taxes/other—net of federal benefit									1,015us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	341us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	56us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State income taxes/other—net of federal benefit									4.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	3.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	1.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Total income tax expense	$ 1,308us-gaap_IncomeTaxExpenseBenefit	$ 3,355us-gaap_IncomeTaxExpenseBenefit	$ 3,160us-gaap_IncomeTaxExpenseBenefit	$ 898us-gaap_IncomeTaxExpenseBenefit	$ 776us-gaap_IncomeTaxExpenseBenefit	$ 1,575us-gaap_IncomeTaxExpenseBenefit	$ 1,733us-gaap_IncomeTaxExpenseBenefit	$ (328)us-gaap_IncomeTaxExpenseBenefit	$ 8,721us-gaap_IncomeTaxExpenseBenefit	$ 3,756us-gaap_IncomeTaxExpenseBenefit	$ 1,416us-gaap_IncomeTaxExpenseBenefit
Total income tax expense									39.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations	38.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations	39.40%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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