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Note 5 - Retirement Plans (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Note 5 - Retirement Plans (Details) [Line Items]  
Defined Benefit Plan, Contributions by Employer $ 0us-gaap_DefinedBenefitPlanContributionsByEmployer
Minimum [Member]  
Note 5 - Retirement Plans (Details) [Line Items]  
Defined Benefit Plan, Expected Contributions in Current Fiscal Year 2,000,000us-gaap_DefinedBenefitPlanExpectedContributionsInCurrentFiscalYear
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
Maximum [Member]  
Note 5 - Retirement Plans (Details) [Line Items]  
Defined Benefit Plan, Expected Contributions in Current Fiscal Year $ 5,300,000us-gaap_DefinedBenefitPlanExpectedContributionsInCurrentFiscalYear
/ us-gaap_RangeAxis
= us-gaap_MaximumMember