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INCOME TAXES - Significant components of deferred tax assets and liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax assets:    
Warranty costs $ 1,362mpx_DeferredTaxAssetsWarrantyCosts $ 1,211mpx_DeferredTaxAssetsWarrantyCosts
Sales incentives and discounts 512mpx_DeferredTaxAssetsSalesIncentivesAndDiscounts 542mpx_DeferredTaxAssetsSalesIncentivesAndDiscounts
Stock-based compensation 996us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 938us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Pension 2,499us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions 1,919us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions
All others 444us-gaap_DeferredTaxAssetsOther 268us-gaap_DeferredTaxAssetsOther
State credits and NOL's 4,674us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 4,634us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Valuation allowance (4,401)us-gaap_DeferredTaxAssetsValuationAllowance (4,359)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets 6,086us-gaap_DeferredTaxAssetsNet 5,153us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:    
Depreciation and amortization expense (392)us-gaap_DeferredTaxLiabilities (880)us-gaap_DeferredTaxLiabilities
Net deferred tax assets $ 5,694us-gaap_DeferredTaxAssetsLiabilitiesNet $ 4,273us-gaap_DeferredTaxAssetsLiabilitiesNet