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Note 2 -Assets Held for Sale and Real Estate - Assets Held for Sale (Details) (Parentheticals)	Dec. 31, 2015 a	Dec. 31, 2014 a
630-Acre Parcel Of Agricultural Land [Member] | Upcountry Maui [Member]
Area of Real Estate Property	630	630
Agricultural Land and Wastewater Treatment Facility [Member] | Upcountry Maui [Member]
Area of Real Estate Property	80
5-Acre Fully Entitled, 42-Unit Workforce Housing Project [Member] | West Maui [Member]
Area of Real Estate Property	5
Number of Units	42

X

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
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:
Period Type:

X

- Details

Name:	us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=mlp_AcreFullyEntitled42unitWorkforceHousingProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=mlp_WestMauiMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: