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Note 14 - Income Taxes (Details) - Statutory Federal Income Tax Rate to Effective Income Tax Rate
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statutory Federal Income Tax Rate to Effective Income Tax Rate [Abstract]      
U.S. statutory federal income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Changes from statutory rates resulting from:      
State income tax, net of federal benefit 2.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 8.60%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes  
Tax-exempt income (1.60%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (1.50%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome (74.10%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
Expenses not deductible for tax purposes 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 0.30%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense 2.60%us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense
(Decrease) increase in deferred tax asset valuation allowance   (240.00%)us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance 352.20%us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance
Other 1.20%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 0.10%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments 1.90%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Effective income tax rate 36.90%us-gaap_EffectiveIncomeTaxRateContinuingOperations (197.50%)us-gaap_EffectiveIncomeTaxRateContinuingOperations 317.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations