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Note 8 - Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2015
Note 8 - Income Taxes (Details) [Line Items]        
Deferred Tax Assets, Valuation Allowance $ 2,052,000us-gaap_DeferredTaxAssetsValuationAllowance $ 2,748,000us-gaap_DeferredTaxAssetsValuationAllowance    
Increase (Decrease) in Pension Plan Obligations (17,100,000)us-gaap_IncreaseDecreaseInPensionPlanObligations 16,000,000us-gaap_IncreaseDecreaseInPensionPlanObligations 6,200,000us-gaap_IncreaseDecreaseInPensionPlanObligations  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax 10,403,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax (9,761,000)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax 3,768,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax  
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax (6,700,000)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax 6,200,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax 2,400,000us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax  
Income Taxes Paid, Net 400,000us-gaap_IncomeTaxesPaidNet 500,000us-gaap_IncomeTaxesPaidNet 800,000us-gaap_IncomeTaxesPaidNet  
Accrued Income Taxes 1,900,000us-gaap_AccruedIncomeTaxes 1,500,000us-gaap_AccruedIncomeTaxes    
Unrecognized Tax Benefits that Would Impact Effective Tax Rate 1,300,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 1,500,000us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate    
Liability for Uncertain Tax Positions, Current 600,000us-gaap_LiabilityForUncertainTaxPositionsCurrent 700,000us-gaap_LiabilityForUncertainTaxPositionsCurrent    
Domestic Tax Authority [Member]        
Note 8 - Income Taxes (Details) [Line Items]        
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 159,800,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember		      
State and Local Jurisdiction [Member] | Valuation Allowance, Operating Loss Carryforwards [Member]        
Note 8 - Income Taxes (Details) [Line Items]        
Deferred Tax Assets, Valuation Allowance 2,100,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember		 2,700,000us-gaap_DeferredTaxAssetsValuationAllowance
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ValuationAllowanceOperatingLossCarryforwardsMember		    
State and Local Jurisdiction [Member]        
Note 8 - Income Taxes (Details) [Line Items]        
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration 181,800,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember		      
Scenario, Forecast [Member]        
Note 8 - Income Taxes (Details) [Line Items]        
Unrecognized Tax Benefits, Period Increase (Decrease)       (500,000)us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
Capital Loss Carryforward [Member]        
Note 8 - Income Taxes (Details) [Line Items]        
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ (700,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_CapitalLossCarryforwardMember		 $ (400,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_CapitalLossCarryforwardMember