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Note 14 - Commitments and Contingencies (Details) (USD $)
Dec. 31, 2014
Settlement Agreement [Member]  
Note 14 - Commitments and Contingencies (Details) [Line Items]  
Percentage of Capital Costs Agreed to be Paid to Install Filtration Systems in Water Well if Presence of Nematocide Exceeds Specified Levels and for Maintenance and Operating Costs 90.00%mlp_PercentageOfCapitalCostsAgreedToBePaidToInstallFiltrationSystemsInWaterWellIfPresenceOfNematocideExceedsSpecifiedLevelsAndForMaintenanceAndOperatingCosts
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= mlp_SettlementAgreementMember
Reserve for Environmental Costs [Member]  
Note 14 - Commitments and Contingencies (Details) [Line Items]  
Loss Contingency Accrual 59,000us-gaap_LossContingencyAccrualAtCarryingValue
/ us-gaap_ValuationAllowancesAndReservesTypeAxis
= us-gaap_ReserveForEnvironmentalCostsMember