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Note 9 - Accrued Retirement Benefits (Details) - Fair Values of Pension Assets (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
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Note 9 - Accrued Retirement Benefits (Details) - Fair Values of Pension Assets [Line Items] |  |  |
Fair value of pension plan assets | $ 64,341 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets | $ 45,178 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets | $ 42,518 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Aon Hewitt Group Trust [Member] |  |  |
Note 9 - Accrued Retirement Benefits (Details) - Fair Values of Pension Assets [Line Items] |  |  |
Fair value of pension plan assets | 9,884 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = mlp_AonHewittGroupTrustMember | 25,061 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = mlp_AonHewittGroupTrustMember |
Equity Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Note 9 - Accrued Retirement Benefits (Details) - Fair Values of Pension Assets [Line Items] |  |  |
Fair value of pension plan assets |  | 957 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
Equity Funds [Member] | Aon Hewitt Group Trust [Member] |  |  |
Note 9 - Accrued Retirement Benefits (Details) - Fair Values of Pension Assets [Line Items] |  |  |
Fair value of pension plan assets | 9,884 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / dei_LegalEntityAxis = mlp_AonHewittGroupTrustMember | 25,061 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember / dei_LegalEntityAxis = mlp_AonHewittGroupTrustMember |
Equity Funds [Member] |  |  |
Note 9 - Accrued Retirement Benefits (Details) - Fair Values of Pension Assets [Line Items] |  |  |
Fair value of pension plan assets |  | 957 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_EquityFundsMember |
Fixed Income Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Aon Hewitt Group Trust [Member] |  |  |
Note 9 - Accrued Retirement Benefits (Details) - Fair Values of Pension Assets [Line Items] |  |  |
Fair value of pension plan assets | 51,483 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = mlp_AonHewittGroupTrustMember | 19,160 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member / dei_LegalEntityAxis = mlp_AonHewittGroupTrustMember |
Fixed Income Funds [Member] | Aon Hewitt Group Trust [Member] |  |  |
Note 9 - Accrued Retirement Benefits (Details) - Fair Values of Pension Assets [Line Items] |  |  |
Fair value of pension plan assets | 51,483 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember / dei_LegalEntityAxis = mlp_AonHewittGroupTrustMember | 19,160 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_FixedIncomeFundsMember / dei_LegalEntityAxis = mlp_AonHewittGroupTrustMember |
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Note 9 - Accrued Retirement Benefits (Details) - Fair Values of Pension Assets [Line Items] |  |  |
Fair value of pension plan assets | 2,974 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |  |
Money Market Funds [Member] |  |  |
Note 9 - Accrued Retirement Benefits (Details) - Fair Values of Pension Assets [Line Items] |  |  |
Fair value of pension plan assets | 2,974 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_MoneyMarketFundsMember |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Note 9 - Accrued Retirement Benefits (Details) - Fair Values of Pension Assets [Line Items] |  |  |
Fair value of pension plan assets | $ 64,341 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | $ 45,178 us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + 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) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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