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CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
ASSETS    
Cash and cash equivalents $ 9,175us-gaap_CashAndCashEquivalentsAtCarryingValue $ 4,072us-gaap_CashAndCashEquivalentsAtCarryingValue
Marketable securities 6,165us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent 3,653us-gaap_AvailableForSaleSecuritiesDebtSecuritiesCurrent
Accounts receivable, net 5,406us-gaap_AccountsReceivableNetCurrent 2,369us-gaap_AccountsReceivableNetCurrent
Inventories 30,412us-gaap_InventoryNet 28,819us-gaap_InventoryNet
Income taxes receivable 366us-gaap_IncomeTaxesReceivable 123us-gaap_IncomeTaxesReceivable
Deferred income taxes 2,323us-gaap_DeferredTaxAssetsNetCurrent 2,480us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other current assets 1,184us-gaap_PrepaidExpenseAndOtherAssetsCurrent 1,706us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Total current assets 55,031us-gaap_AssetsCurrent 43,222us-gaap_AssetsCurrent
Property, plant and equipment, less accumulated depreciation of $24,324 in 2015 and $24,180 in 2014 10,525us-gaap_PropertyPlantAndEquipmentNet 9,890us-gaap_PropertyPlantAndEquipmentNet
Goodwill 3,308us-gaap_Goodwill 3,308us-gaap_Goodwill
Other intangibles, net 465us-gaap_IntangibleAssetsNetExcludingGoodwill 465us-gaap_IntangibleAssetsNetExcludingGoodwill
Marketable securities 28,694us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent 33,831us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent
Deferred income taxes 2,761us-gaap_DeferredTaxAssetsNetNoncurrent 3,214us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets 9,973us-gaap_OtherAssetsNoncurrent 9,893us-gaap_OtherAssetsNoncurrent
Total assets 110,757us-gaap_Assets 103,823us-gaap_Assets
LIABILITIES AND STOCKHOLDERS' EQUITY    
Accounts payable 8,503us-gaap_AccountsPayableCurrent 3,577us-gaap_AccountsPayableCurrent
Accrued expenses and other liabilities 10,788mpx_AccruedExpensesAndOtherCurrentLiabilities 9,631mpx_AccruedExpensesAndOtherCurrentLiabilities
Total current liabilities 19,291us-gaap_LiabilitiesCurrent 13,208us-gaap_LiabilitiesCurrent
Pension liabilities 6,675us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent 7,039us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent
Other long-term liabilities 79us-gaap_OtherLiabilitiesNoncurrent 82us-gaap_OtherLiabilitiesNoncurrent
Total liabilities 26,045us-gaap_Liabilities 20,329us-gaap_Liabilities
Common stock 3,833us-gaap_CommonStockValueOutstanding 3,813us-gaap_CommonStockValueOutstanding
Capital in excess of par value 3,670us-gaap_AdditionalPaidInCapitalCommonStock 3,895us-gaap_AdditionalPaidInCapitalCommonStock
Retained earnings 79,152us-gaap_RetainedEarningsAccumulatedDeficit 77,755us-gaap_RetainedEarningsAccumulatedDeficit
Accumulated other comprehensive loss (1,943)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (1,969)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Total stockholders' equity 84,712us-gaap_StockholdersEquity 83,494us-gaap_StockholdersEquity
Total liabilities and stockholders' equity $ 110,757us-gaap_LiabilitiesAndStockholdersEquity $ 103,823us-gaap_LiabilitiesAndStockholdersEquity