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Note 8 - Benefit Plans (Details) - Actual and Target Pension Plan Asset Allocation
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Note 8 - Benefit Plans (Details) - Actual and Target Pension Plan Asset Allocation [Line Items]    
Percentage of plan assets 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations 100.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
Target allocation 100.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations  
Equity Securities [Member]    
Note 8 - Benefit Plans (Details) - Actual and Target Pension Plan Asset Allocation [Line Items]    
Percentage of plan assets 59.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		 63.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember
Target allocation 65.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_InvestmentTypeAxis
= us-gaap_EquitySecuritiesMember		  
Fixed Income Investments [Member]    
Note 8 - Benefit Plans (Details) - Actual and Target Pension Plan Asset Allocation [Line Items]    
Percentage of plan assets 16.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedIncomeInvestmentsMember		 15.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedIncomeInvestmentsMember
Target allocation 15.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_InvestmentTypeAxis
= us-gaap_FixedIncomeInvestmentsMember		  
Other than Securities Investment [Member]    
Note 8 - Benefit Plans (Details) - Actual and Target Pension Plan Asset Allocation [Line Items]    
Percentage of plan assets 25.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherThanSecuritiesInvestmentMember		 22.00%us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherThanSecuritiesInvestmentMember
Target allocation 20.00%us-gaap_DefinedBenefitPlanTargetPlanAssetAllocations
/ us-gaap_InvestmentTypeAxis
= us-gaap_OtherThanSecuritiesInvestmentMember