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Note 6 - Long-Term Debt - Summary of Long-term Debt (Details) (Parentheticals) - Scenario, Unspecified [Domain]	Jun. 30, 2015	Dec. 31, 2014
Wells Fargo Revolving Loans [Member]
Revolving loans, interest rate	3.83%	3.82%
American Ag Credit Term Loan [Member]
Revolving loans, interest rate	8.00%	5.00%
First Hawaiian Bank Revolving Line of Credit [Member]
Revolving loans, interest rate	4.38%	4.38%

X

- 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

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Details

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

X

- Details

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