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Note 4 - Long-Term Debt - Summary of Long-term Debt (Details) (Parentheticals) | Dec. 31, 2015
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Wells Fargo Revolving Loans [Member] |
Interest rate | 4.00%
First Hawaiian Bank Revolving Line of Credit [Member] |
Interest rate | 4.37%
American Ag Credit Term Loan [Member] |
Interest rate | 7.00%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=mlp_AmericanAgCreditTermLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |