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Note 8 - Accrued Retirement Benefits (Details Textual) (USD $) In Millions, unless otherwise specified	1 Months Ended	0 Months Ended
	Nov. 30, 2012 acre	Oct. 09, 2014	Oct. 31, 2011
Defined Benefit Plan, Additional Security to Support Unfunded Liabilities			$ 23.9mlp_DefinedBenefitPlanAdditionalSecurityToSupportUnfundedLiabilities
Defined Benefit Plan, Area of Real Estate Property Pledged as Security	8,400mlp_DefinedBenefitPlanAreaOfRealEstatePropertyPledgedAsSecurity
Defined Benefit Plan, Period for Release of Real Estate Property Pledged as Security	5 years
Agriculture [Member] | West Maui [Member]
Proceeds from Sale of Productive Assets		19.8us-gaap_ProceedsFromSaleOfProductiveAssets / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlp_AgricultureMember / us-gaap_StatementGeographicalAxis = mlp_WestMauiMember
Proceeds from Sale of Productive Assets Used to Fund Pension Plans		$ 19.4mlp_ProceedsFromSaleOfProductiveAssetsUsedToFundPensionPlans / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = mlp_AgricultureMember / us-gaap_StatementGeographicalAxis = mlp_WestMauiMember

X

- Definition

Represents the additional security provided to support the unfunded liabilities of the pension plans.

+ References

No definition available.

+ Details

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Namespace Prefix:	mlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Represents the area of real estate property pledged as security.

+ References

No definition available.

+ Details

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Namespace Prefix:	mlp_
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Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period for release of real estate property pledged as collateral.

+ References

No definition available.

+ Details

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Namespace Prefix:	mlp_
Data Type:	xbrli:durationItemType
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X

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets utilized to fund the company's pension plan.

+ References

No definition available.

+ Details

Name:	mlp_ProceedsFromSaleOfProductiveAssetsUsedToFundPensionPlans
Namespace Prefix:	mlp_
Data Type:	xbrli:monetaryItemType
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X

- Definition

The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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