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Note 11 - Income Taxes (Details) - Summary of Deferred Tax Assets and Liabilities (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Summary of Deferred Tax Assets and Liabilities [Abstract]    
Net operating loss and tax credit carryforwards $ 50,361mlp_DeferredTaxAssetsOperatingLossCarryforwardsAndTaxCreditCarryforwards $ 46,205mlp_DeferredTaxAssetsOperatingLossCarryforwardsAndTaxCreditCarryforwards
Joint venture and other investments 238us-gaap_DeferredTaxAssetsInvestments 294us-gaap_DeferredTaxAssetsInvestments
Accrued retirement benefits 2,550us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits 7,458us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits
Property net book value 2,715us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment 2,825us-gaap_DeferredTaxAssetsPropertyPlantAndEquipment
Deferred revenue 1,160us-gaap_DeferredTaxAssetsDeferredIncome 1,522us-gaap_DeferredTaxAssetsDeferredIncome
Stock compensation 154us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 150us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Reserves and other 447mlp_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesAndOther 671mlp_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReservesAndOther
Total deferred tax assets 57,625us-gaap_DeferredTaxAssetsGross 59,125us-gaap_DeferredTaxAssetsGross
Valuation allowance $ (57,625)us-gaap_DeferredTaxAssetsValuationAllowance $ (59,125)us-gaap_DeferredTaxAssetsValuationAllowance