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Note 4 - Long-term Debt (Details Textual) - First Hawaiian Bank Revolving Line of Credit [Member] - Revolving Credit Facility [Member] $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) ft²
Line of Credit Facility, Maximum Borrowing Capacity | $ 15,000
Line of Credit Facility, Commitment Fee Amount | 0
Debt Instrument, Covenant, Required Minimum Liquidity | 2,000
Debt Instrument, Covenant, Maximum Total Liabilities | $ 45,000
Kapalua Resort [Member] |
Pledged Assets not Separately Reported, Area of Real Estate (Square Foot) | ft² | 30,000
Base Rate [Member] |
Debt Instrument, Basis Spread on Variable Rate | 0.01125%

X
- Definition Represents the maximum total liabilities allowed under a debt instrument's covenant. + References No definition available. + Details
Name: | mlp_DebtInstrumentCovenantMaximumTotalLiabilities
Namespace Prefix: | mlp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the minimum amount of liquidity required to be maintained under financial covenants. + References No definition available. + Details
Name: | mlp_DebtInstrumentCovenantRequiredLiquidity
Namespace Prefix: | mlp_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Area of real estate owned but transferred to serve as collateral for the payment of the related debt obligation, primarily a secured borrowing or repurchase agreement, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References No definition available. + Details
Name: | mlp_PledgedAssetsNotSeparatelyReportedAreaOfRealEstate
Namespace Prefix: | mlp_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of the fee for available but unused credit capacity under the credit facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeeAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=mlp_FirstHawaiianBankRevolvingLineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=mlp_KapaluaResortMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |