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Note 6 - Summary of Long-term Debt (Details) (Parentheticals)	Mar. 31, 2016	Dec. 31, 2015
Wells Fargo Revolving Loans [Member]
Debt Instrument, Interest Rate, Stated Percentage		4.00%
American Ag Credit Term Loan [Member]
Debt Instrument, Interest Rate, Stated Percentage	7.00%	7.00%

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: