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Note 8 - Income Taxes (Details) - Federal and State Income Tax Expense (Benefit) Summary (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current:      
Federal $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit $ 0us-gaap_CurrentFederalTaxExpenseBenefit
State and local 996us-gaap_CurrentStateAndLocalTaxExpenseBenefit 118us-gaap_CurrentStateAndLocalTaxExpenseBenefit 974us-gaap_CurrentStateAndLocalTaxExpenseBenefit
State and local - reserve for uncertain tax positions (198)us-gaap_IncomeTaxReconciliationTaxContingenciesStateAndLocal (136)us-gaap_IncomeTaxReconciliationTaxContingenciesStateAndLocal (1,015)us-gaap_IncomeTaxReconciliationTaxContingenciesStateAndLocal
Current income tax expense (benefit) 798us-gaap_CurrentIncomeTaxExpenseBenefit (18)us-gaap_CurrentIncomeTaxExpenseBenefit (41)us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:      
Federal 28,231us-gaap_DeferredFederalIncomeTaxExpenseBenefit 12,218us-gaap_DeferredFederalIncomeTaxExpenseBenefit 16,854us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local 2,707us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 947us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 2,375us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred income tax expense 30,938us-gaap_DeferredIncomeTaxExpenseBenefit 13,165us-gaap_DeferredIncomeTaxExpenseBenefit 19,229us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense $ 31,736us-gaap_IncomeTaxExpenseBenefit $ 13,147us-gaap_IncomeTaxExpenseBenefit $ 19,188us-gaap_IncomeTaxExpenseBenefit