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Note 9 - Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	24 Months Ended
	Mar. 31, 2015	Apr. 30, 2013
Income Tax Examination Tax Penalties and Interest Accrued		$ 1.8mlp_IncomeTaxExaminationTaxPenaltiesAndInterestAccrued
Income Taxes Paid	$ 1.4us-gaap_IncomeTaxesPaid

X

- Definition

The amount of estimated tax, penalties and interest accrued as of the balance sheet date arising from income tax examinations.

+ References

No definition available.

+ Details

Name:	mlp_IncomeTaxExaminationTaxPenaltiesAndInterestAccrued
Namespace Prefix:	mlp_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 25

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585

+ Details

Name:	us-gaap_IncomeTaxesPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration