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Note 9 - Discontinued Operations (Details Textual) - USD ($) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 01, 2021 | May 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Proceeds from Sale of Productive Assets, Total |  |  | $ 4,203 | $ 0
PUC-regulated Assets of Kapalua Water Company, Ltd and Kapalua Waste Treatment Company, Ltd [Member] |  |  |  |
Proceeds from Sale of Productive Assets, Total | $ 4,200 | $ 4,200 |  |

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- Definition The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3179-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis=mlp_PucregulatedAssetsOfKapaluaWaterCompanyLtdAndKapaluaWasteTreatmentCompanyLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |