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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 13,547us-gaap_ProfitLoss $ 17,648us-gaap_ProfitLoss $ 12,328us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 13,632us-gaap_DepreciationDepletionAndAmortization 13,122us-gaap_DepreciationDepletionAndAmortization 12,465us-gaap_DepreciationDepletionAndAmortization
Share-based compensation expense 7,624us-gaap_ShareBasedCompensation 7,097us-gaap_ShareBasedCompensation 7,592us-gaap_ShareBasedCompensation
Excess tax benefits from stock-based awards (2,046)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (476)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (218)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Impairment of technology 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived 0us-gaap_ImpairmentOfIntangibleAssetsFinitelived 1,000us-gaap_ImpairmentOfIntangibleAssetsFinitelived
(Gain) loss on disposal of assets (21)us-gaap_GainLossOnSaleOfPropertyPlantEquipment (33)us-gaap_GainLossOnSaleOfPropertyPlantEquipment 1us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Deferred income tax provision (2,115)us-gaap_DeferredIncomeTaxesAndTaxCredits (3,677)us-gaap_DeferredIncomeTaxesAndTaxCredits 9,654us-gaap_DeferredIncomeTaxesAndTaxCredits
Other, net 0us-gaap_OtherNoncashIncomeExpense 61us-gaap_OtherNoncashIncomeExpense 0us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities:      
Accounts receivable (1,086)us-gaap_IncreaseDecreaseInAccountsReceivable (1,073)us-gaap_IncreaseDecreaseInAccountsReceivable (1,135)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (915)us-gaap_IncreaseDecreaseInInventories 208us-gaap_IncreaseDecreaseInInventories (4,684)us-gaap_IncreaseDecreaseInInventories
Prepaid taxes (2,871)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable (544)us-gaap_IncreaseDecreaseInIncomeTaxesReceivable 2,569us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Prepaid expenses and other assets 125us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,558)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,469)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable 1,803us-gaap_IncreaseDecreaseInAccountsPayable (8,784)us-gaap_IncreaseDecreaseInAccountsPayable 3,928us-gaap_IncreaseDecreaseInAccountsPayable
Income taxes payable (64)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 683us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (3,508)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Accrued liabilities and other long-term liabilities (402)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 2,920us-gaap_IncreaseDecreaseInOtherOperatingLiabilities (976)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Deferred income on shipments to distributors (4,079)mcrl_IncreaseDecreaseInDeferredIncomeOnShipmentsToDistributors 1,258mcrl_IncreaseDecreaseInDeferredIncomeOnShipmentsToDistributors (4,903)mcrl_IncreaseDecreaseInDeferredIncomeOnShipmentsToDistributors
Net cash provided by operating activities 23,132us-gaap_NetCashProvidedByUsedInOperatingActivities 26,852us-gaap_NetCashProvidedByUsedInOperatingActivities 32,644us-gaap_NetCashProvidedByUsedInOperatingActivities
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchase of PhaseLink's net assets, net of cash acquired 0us-gaap_PaymentsToAcquireProductiveAssets 0us-gaap_PaymentsToAcquireProductiveAssets (17,370)us-gaap_PaymentsToAcquireProductiveAssets
Purchase of Discera’s net assets 0us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries (6,122)us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries 0us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries
Purchases of property, plant and equipment (11,734)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (7,325)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (9,022)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchase of intangible asset 0us-gaap_PaymentsToAcquireIntangibleAssets (410)us-gaap_PaymentsToAcquireIntangibleAssets 0us-gaap_PaymentsToAcquireIntangibleAssets
Purchases of investments (55,166)us-gaap_PaymentsToAcquireInvestments (59,653)us-gaap_PaymentsToAcquireInvestments (55,819)us-gaap_PaymentsToAcquireInvestments
Proceeds from sale and maturities of investments 57,669us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments 71,490us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments 60,108us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Change in restricted cash 1,072us-gaap_IncreaseDecreaseInRestrictedCash (825)us-gaap_IncreaseDecreaseInRestrictedCash (291)us-gaap_IncreaseDecreaseInRestrictedCash
Net cash used in investing activities (8,159)us-gaap_NetCashProvidedByUsedInInvestingActivities (2,845)us-gaap_NetCashProvidedByUsedInInvestingActivities (22,394)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES:      
Repayments of debt 0us-gaap_RepaymentsOfLongTermDebt 0us-gaap_RepaymentsOfLongTermDebt (282)us-gaap_RepaymentsOfLongTermDebt
Proceeds from the issuance of common stock 13,101us-gaap_ProceedsFromIssuanceOfCommonStock 4,390us-gaap_ProceedsFromIssuanceOfCommonStock 3,642us-gaap_ProceedsFromIssuanceOfCommonStock
Repurchases of common stock (19,970)us-gaap_PaymentsForRepurchaseOfCommonStock (23,336)us-gaap_PaymentsForRepurchaseOfCommonStock (34,551)us-gaap_PaymentsForRepurchaseOfCommonStock
Payment of cash dividends (11,299)us-gaap_PaymentsOfDividendsCommonStock (8,219)us-gaap_PaymentsOfDividendsCommonStock (12,072)us-gaap_PaymentsOfDividendsCommonStock
Purchase of stock for withholding taxes on vested restricted stock (1,455)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (812)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (534)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Excess tax benefits from stock-based awards 2,046us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 476us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 218us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net cash used in financing activities (17,577)us-gaap_NetCashProvidedByUsedInFinancingActivities (27,501)us-gaap_NetCashProvidedByUsedInFinancingActivities (43,579)us-gaap_NetCashProvidedByUsedInFinancingActivities
NET DECREASE IN CASH AND CASH EQUIVALENTS (2,604)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (3,494)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (33,329)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS - Beginning of year 23,787us-gaap_CashAndCashEquivalentsAtCarryingValue 27,281us-gaap_CashAndCashEquivalentsAtCarryingValue 60,610us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS - End of year 21,183us-gaap_CashAndCashEquivalentsAtCarryingValue 23,787us-gaap_CashAndCashEquivalentsAtCarryingValue 27,281us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the year for:      
Interest 0us-gaap_InterestPaid 0us-gaap_InterestPaid 2us-gaap_InterestPaid
Income taxes $ 8,432us-gaap_IncomeTaxesPaid $ 5,457us-gaap_IncomeTaxesPaid $ 7,060us-gaap_IncomeTaxesPaid