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Note 2 -Assets Held for Sale and Real Estate - Assets Held for Sale (Details) (Parentheticals) | Dec. 31, 2016 a | Dec. 31, 2015 a
--- | --- | ---
630-Acre Parcel Of Agricultural Land [Member] | Upcountry Maui [Member] |  |
Area of Real Estate (Acre) | 630 | 630
Agricultural Land and Wastewater Treatment Facility [Member] | Upcountry Maui [Member] |  |
Area of Real Estate (Acre) | 80 | 80
Kapalua Resort, Golf Practice Course [Member] | West Maui [Member] |  |
Area of Real Estate (Acre) |  | 15
5-Acre Fully Entitled, 42-Unit Workforce Housing Project [Member] | West Maui [Member] |  |
Area of Real Estate (Acre) | 5 |
Number of Units | 42 |

X
- Definition Area of a real estate property. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfUnitsInRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=mlp_AcreParcelOfAgriculturalLandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=mlp_UpcountryMauiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=mlp_AgriculturalLandAndWastewaterTreatmentFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=mlp_KapaluaResortGolfPracticeCourseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementGeographicalAxis=mlp_WestMauiMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=mlp_AcreFullyEntitled42unitWorkforceHousingProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |