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

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Period Type: | duration

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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of the employer's best estimate of contributions expected to be paid to the plan in the current fiscal period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2709-114920 + Details
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Period Type: | duration

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