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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
OPERATING ACTIVITIES    
Net income $ 2,929us-gaap_NetIncomeLoss $ 1,978us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 174us-gaap_DepreciationDepletionAndAmortization 181us-gaap_DepreciationDepletionAndAmortization
Gain on sale of equipment and property (12)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (12)us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Stock-based compensation expense 487us-gaap_ShareBasedCompensation 444us-gaap_ShareBasedCompensation
Excess tax benefits for share-based payments (185)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (284)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Deferred income tax provision 586us-gaap_DeferredIncomeTaxExpenseBenefit 223us-gaap_DeferredIncomeTaxExpenseBenefit
(Increase) decrease in assets:    
Accounts receivable (3,037)us-gaap_IncreaseDecreaseInAccountsReceivable (979)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (1,593)us-gaap_IncreaseDecreaseInInventories 2,311us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets 522us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 646us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Income taxes receivable (243)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable 276us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Other non-current assets (80)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets (213)us-gaap_IncreaseDecreaseInOtherNoncurrentAssets
Increase (decrease) in liabilities:    
Accounts payable 4,926us-gaap_IncreaseDecreaseInAccountsPayable 2,840us-gaap_IncreaseDecreaseInAccountsPayable
Income taxes payable 222us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 312us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Accrued expenses and other liabilities 1,120us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities 1,741us-gaap_IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities
Other long-term liabilities (348)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities (133)us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities
Net cash provided by operating activities 5,468us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 9,331us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
INVESTING ACTIVITIES    
Capital expenditures (804)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (102)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of assets 7us-gaap_ProceedsFromSaleOfProductiveAssets 34us-gaap_ProceedsFromSaleOfProductiveAssets
Purchases of marketable securities (2,038)us-gaap_PaymentsToAcquireMarketableSecurities (6,867)us-gaap_PaymentsToAcquireMarketableSecurities
Sales of marketable securities 4,685mpx_ProceedsFromSaleOfMarketableSecurities 2,459mpx_ProceedsFromSaleOfMarketableSecurities
Maturities of marketable securities   400mpx_ProceedsFromMaturityOfMarketableSecurities
Net cash provided by (used for) investing activities 1,850us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (4,076)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
FINANCING ACTIVITIES    
Payment of dividends (1,532)us-gaap_PaymentsOfDividends (1,145)us-gaap_PaymentsOfDividends
Excess tax benefits for share-based payments 185us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 284us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Cash paid for common stock purchased and retired (868)us-gaap_PaymentsForRepurchaseOfCommonStock (845)us-gaap_PaymentsForRepurchaseOfCommonStock
Net cash used for financing activities (2,215)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (1,706)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 5,103us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 3,549us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 4,072us-gaap_CashAndCashEquivalentsAtCarryingValue 5,114us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 9,175us-gaap_CashAndCashEquivalentsAtCarryingValue 8,663us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental information:    
Income tax payments, net $ 875us-gaap_IncomeTaxesPaidNet $ 100us-gaap_IncomeTaxesPaidNet