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Consolidated Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating activities:    
Net earnings $ 4,227us-gaap_NetIncomeLoss $ 4,632us-gaap_NetIncomeLoss
Adjustments to reconcile net earnings to net cash provided by (used for) operations:    
Depreciation 2,202us-gaap_Depreciation 2,474us-gaap_Depreciation
Amortization 2,446us-gaap_AdjustmentForAmortization 1,274us-gaap_AdjustmentForAmortization
Deferred income taxes (135)us-gaap_DeferredIncomeTaxExpenseBenefit (66)us-gaap_DeferredIncomeTaxExpenseBenefit
Noncurrent employee benefits 148us-gaap_PensionAndOtherPostretirementBenefitExpense (113)us-gaap_PensionAndOtherPostretirementBenefitExpense
Stock-based compensation expense 371us-gaap_ShareBasedCompensation 363us-gaap_ShareBasedCompensation
Changes in:    
Receivables 110us-gaap_IncreaseDecreaseInAccountsReceivable (4,772)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories (692)us-gaap_IncreaseDecreaseInInventories (2,998)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets 405us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 646us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Liabilities other than debt (2,302)us-gaap_IncreaseDecreaseInOperatingLiabilities (859)us-gaap_IncreaseDecreaseInOperatingLiabilities
Total adjustments 2,553us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities (4,051)us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided by operations 6,780us-gaap_NetCashProvidedByUsedInOperatingActivities 581us-gaap_NetCashProvidedByUsedInOperatingActivities
Investing activities:    
Property, plant and equipment expenditures (3,197)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (3,328)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used for investing activities (3,197)us-gaap_NetCashProvidedByUsedInInvestingActivities (3,328)us-gaap_NetCashProvidedByUsedInInvestingActivities
Financing activities:    
Net increase in short-term debt 578us-gaap_ProceedsFromRepaymentsOfShortTermDebt 3,784us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Dividends paid (2,733)us-gaap_PaymentsOfDividendsCommonStock (2,580)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from exercise of stock options 127us-gaap_ProceedsFromStockOptionsExercised 417us-gaap_ProceedsFromStockOptionsExercised
Tax benefit on stock options 49us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 145us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Issuance of treasury stock 60us-gaap_ProceedsFromSaleOfTreasuryStock 66us-gaap_ProceedsFromSaleOfTreasuryStock
Net cash provided by (used for) financing activities (1,919)us-gaap_NetCashProvidedByUsedInFinancingActivities 1,832us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of foreign exchange rates on cash 53us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents 60us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Increase (decrease) in cash 1,717us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (855)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash - beginning of period 6,656us-gaap_Cash 7,263us-gaap_Cash
Cash - end of period $ 8,373us-gaap_Cash $ 6,408us-gaap_Cash