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Note 12 - Income Taxes (Details) - Effective Income Tax Rate Reconciliation (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Effective Income Tax Rate Reconciliation [Abstract]    
Taxes at federal statutory rate $ 4,998us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ 6,028us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Taxes at federal statutory rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Increase (reduction) in taxes resulting from:    
State and local income tax, net of Federal income tax benefit 841us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 1,410us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
State and local income tax, net of Federal income tax benefit 5.90%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes 8.20%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Other (293)us-gaap_IncomeTaxReconciliationOtherAdjustments (511)us-gaap_IncomeTaxReconciliationOtherAdjustments
Other (2.10%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments (3.00%)us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Taxes at effective rate $ 5,546us-gaap_IncomeTaxExpenseBenefit $ 6,927us-gaap_IncomeTaxExpenseBenefit
Taxes at effective rate 38.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 40.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations