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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:      
Income from continuing operations $ 20,383us-gaap_IncomeLossFromContinuingOperations $ 48,124us-gaap_IncomeLossFromContinuingOperations $ 10,642us-gaap_IncomeLossFromContinuingOperations
Income (loss) from discontinued operations (1,588)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (170)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 6,241us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income 18,795us-gaap_NetIncomeLoss 47,954us-gaap_NetIncomeLoss 16,883us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 4,024us-gaap_DepreciationDepletionAndAmortization 3,344us-gaap_DepreciationDepletionAndAmortization 3,269us-gaap_DepreciationDepletionAndAmortization
Bad debt expense (reduction) 104us-gaap_ProvisionForDoubtfulAccounts 588us-gaap_ProvisionForDoubtfulAccounts (13)us-gaap_ProvisionForDoubtfulAccounts
Inventory lower-of-cost-or-market adjustments 457us-gaap_InventoryWriteDown 557us-gaap_InventoryWriteDown 402us-gaap_InventoryWriteDown
Stock-based compensation expense 1,066us-gaap_ShareBasedCompensation 454us-gaap_ShareBasedCompensation 630us-gaap_ShareBasedCompensation
(Gain) loss on asset disposals 145us-gaap_GainLossOnDispositionOfAssets 2us-gaap_GainLossOnDispositionOfAssets (30)us-gaap_GainLossOnDispositionOfAssets
Deferred income taxes, net of valuation allowances 8,007us-gaap_DeferredIncomeTaxesAndTaxCredits (32,814)us-gaap_DeferredIncomeTaxesAndTaxCredits 145us-gaap_DeferredIncomeTaxesAndTaxCredits
Excess tax deficiency related to stock-based awards 180us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities 145us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities 0us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Reclassification of foreign currency translation gains to income upon substantial liquidation of subsidiaries 0nls_DiscontinuedOperationReclassificationOfForeignCurrencyTranslationGainsToIncomeUponSubstantialLiquidationOfSubsidiaries 0nls_DiscontinuedOperationReclassificationOfForeignCurrencyTranslationGainsToIncomeUponSubstantialLiquidationOfSubsidiaries (6,170)nls_DiscontinuedOperationReclassificationOfForeignCurrencyTranslationGainsToIncomeUponSubstantialLiquidationOfSubsidiaries
Changes in operating assets and liabilities:      
Trade receivables (1,331)us-gaap_IncreaseDecreaseInAccountsReceivable (4,417)us-gaap_IncreaseDecreaseInAccountsReceivable 1,928us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (9,560)us-gaap_IncreaseDecreaseInInventories 2,388us-gaap_IncreaseDecreaseInInventories (7,573)us-gaap_IncreaseDecreaseInInventories
Prepaids and other current assets (314)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,174)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (1,314)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Income taxes receivable 30us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable (91)us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable 464us-gaap_IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable
Trade payables 10,456us-gaap_IncreaseDecreaseInAccountsPayable 4,487us-gaap_IncreaseDecreaseInAccountsPayable 4,189us-gaap_IncreaseDecreaseInAccountsPayable
Accrued liabilities, including warranty obligations 2,313us-gaap_IncreaseDecreaseInAccruedLiabilities (337)us-gaap_IncreaseDecreaseInAccruedLiabilities 3us-gaap_IncreaseDecreaseInAccruedLiabilities
Net cash provided by operating activities 34,372us-gaap_NetCashProvidedByUsedInOperatingActivities 21,086us-gaap_NetCashProvidedByUsedInOperatingActivities 12,813us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:      
Proceeds from sale of discontinued operations 0us-gaap_ProceedsFromDivestitureOfBusinesses 116us-gaap_ProceedsFromDivestitureOfBusinesses 410us-gaap_ProceedsFromDivestitureOfBusinesses
Proceeds from other asset sales 0us-gaap_ProceedsFromSaleOfOtherProductiveAssets 5us-gaap_ProceedsFromSaleOfOtherProductiveAssets 6us-gaap_ProceedsFromSaleOfOtherProductiveAssets
Purchases of software and equipment (3,181)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,590)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (2,442)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Purchases of available-for-sale-securities (37,434)us-gaap_PaymentsToAcquireAvailableForSaleSecurities 0us-gaap_PaymentsToAcquireAvailableForSaleSecurities 0us-gaap_PaymentsToAcquireAvailableForSaleSecurities
Proceeds from maturities of available-for-sale securities 10,450us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 0us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities 0us-gaap_ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities
Net cash used in investing activities (30,165)us-gaap_NetCashProvidedByUsedInInvestingActivities (3,469)us-gaap_NetCashProvidedByUsedInInvestingActivities (2,026)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:      
Repayment of long-term borrowings 0us-gaap_RepaymentsOfLongTermDebt 0us-gaap_RepaymentsOfLongTermDebt (5,000)us-gaap_RepaymentsOfLongTermDebt
Proceeds from exercise of stock options 378us-gaap_ProceedsFromStockOptionsExercised 357us-gaap_ProceedsFromStockOptionsExercised 113us-gaap_ProceedsFromStockOptionsExercised
Excess tax deficiency related to stock-based awards (180)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation (145)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation 0us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Net cash provided by (used in) financing activities 198us-gaap_NetCashProvidedByUsedInFinancingActivities 212us-gaap_NetCashProvidedByUsedInFinancingActivities (4,887)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents (178)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (57)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (120)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Increase in cash and cash equivalents 4,227us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 17,772us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 5,780us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents, beginning of year 40,979us-gaap_CashAndCashEquivalentsAtCarryingValue 23,207us-gaap_CashAndCashEquivalentsAtCarryingValue 17,427us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents, end of year 45,206us-gaap_CashAndCashEquivalentsAtCarryingValue 40,979us-gaap_CashAndCashEquivalentsAtCarryingValue 23,207us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:      
Cash paid for income taxes, net (923)us-gaap_IncomeTaxesPaidNet (450)us-gaap_IncomeTaxesPaidNet (277)us-gaap_IncomeTaxesPaidNet
Cash paid for interest (25)us-gaap_InterestPaid (36)us-gaap_InterestPaid (544)us-gaap_InterestPaid
Capital expenditures incurred but not yet paid $ 86us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 0us-gaap_CapitalExpendituresIncurredButNotYetPaid $ 0us-gaap_CapitalExpendituresIncurredButNotYetPaid