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Note 5 - Long-term Debt (Details) - Summary of Long-term Debt (Parentheticals) | Dec. 31, 2014 | Dec. 31, 2013
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Wells Fargo Revolving Loans [Member] |  |
Debt Instrument [Line Items] |  |
Wells Fargo revolving loans, interest rate | 3.82%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = mlp_WellsFargoRevolvingLoansMember | 3.99%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd / us-gaap_LongtermDebtTypeAxis = mlp_WellsFargoRevolvingLoansMember
American AgCredit Term Loan [Member] |  |
Debt Instrument [Line Items] |  |
American AgCredit term loan, interest rate | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mlp_AmericanAgCreditTermLoanMember | 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = mlp_AmericanAgCreditTermLoanMember

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The effective interest rate at the end of the reporting period. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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

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