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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Cash flows from operating activities:    
Net income $ 9,566us-gaap_NetIncomeLoss $ 11,278us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 29,085us-gaap_DepreciationDepletionAndAmortization 29,248us-gaap_DepreciationDepletionAndAmortization
Remeasurement (gain)/loss on foreign currency (7)elrc_RemeasurementGainLoss 85elrc_RemeasurementGainLoss
Provision for losses on accounts receivable 381us-gaap_ProvisionForDoubtfulAccounts 341us-gaap_ProvisionForDoubtfulAccounts
Gain on sale of rental and lease equipment (6,625)elrc_GainLossOnSaleOfRentalAndLeaseEquipment (6,504)elrc_GainLossOnSaleOfRentalAndLeaseEquipment
Stock compensation expense 649us-gaap_ShareBasedCompensation 724us-gaap_ShareBasedCompensation
Excess tax benefit for share based compensation (116)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (131)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Deferred income taxes (4,526)us-gaap_DeferredIncomeTaxExpenseBenefit (4,157)us-gaap_DeferredIncomeTaxExpenseBenefit
Change in operating assets and liabilities:    
Accounts receivable (2,662)us-gaap_IncreaseDecreaseInAccountsReceivable (226)us-gaap_IncreaseDecreaseInAccountsReceivable
Other assets (4,194)us-gaap_IncreaseDecreaseInOtherOperatingAssets (2,656)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable 789us-gaap_IncreaseDecreaseInAccountsPayable (8)us-gaap_IncreaseDecreaseInAccountsPayable
Accrued expenses 1,199us-gaap_IncreaseDecreaseInAccruedLiabilities (2,075)us-gaap_IncreaseDecreaseInAccruedLiabilities
Deferred revenue (543)us-gaap_IncreaseDecreaseInDeferredRevenue 422us-gaap_IncreaseDecreaseInDeferredRevenue
Net cash provided by operating activities 22,996us-gaap_NetCashProvidedByUsedInOperatingActivities 26,341us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities:    
Proceeds from sale of rental and lease equipment 16,168us-gaap_ProceedsFromSaleOfProductiveAssets 15,125us-gaap_ProceedsFromSaleOfProductiveAssets
Payments for purchase of rental and lease equipment (32,985)us-gaap_PaymentsToAcquireProductiveAssets (31,790)us-gaap_PaymentsToAcquireProductiveAssets
Payments for purchase of other property (250)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (343)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Net cash used in investing activities (17,067)us-gaap_NetCashProvidedByUsedInInvestingActivities (17,008)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities:    
Borrowings under bank lines of credit 31,070us-gaap_ProceedsFromLongTermLinesOfCredit 31,508us-gaap_ProceedsFromLongTermLinesOfCredit
Payments under bank lines of credit (28,227)us-gaap_RepaymentsOfLongTermLinesOfCredit (33,000)us-gaap_RepaymentsOfLongTermLinesOfCredit
Minimum tax withholdings on share based compensation (10)us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation 0us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
Excess tax benefit for share based compensation 116us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 131us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Payment of dividends (9,902)us-gaap_PaymentsOfDividendsCommonStock (9,924)us-gaap_PaymentsOfDividendsCommonStock
Net cash used in financing activities (6,953)us-gaap_NetCashProvidedByUsedInFinancingActivities (11,285)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash 278us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents (259)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net decrease in cash (746)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (2,211)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash at beginning of period 5,946us-gaap_CashAndCashEquivalentsAtCarryingValue 10,402us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash at end of period 5,200us-gaap_CashAndCashEquivalentsAtCarryingValue 8,191us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Cash Flow Information    
Interest paid, during the period 17us-gaap_InterestPaidNet 80us-gaap_InterestPaidNet
Net income taxes paid, during the period 7,712us-gaap_IncomeTaxesPaidNet 12,909us-gaap_IncomeTaxesPaidNet
Dividends accrued during the period, not yet paid 104us-gaap_DividendsPayableCurrentAndNoncurrent 161us-gaap_DividendsPayableCurrentAndNoncurrent
Rental equipment acquisitions, not yet paid 3,843us-gaap_CapitalExpendituresIncurredButNotYetPaid 3,267us-gaap_CapitalExpendituresIncurredButNotYetPaid
Used equipment sales in accounts receivable and other assets, not yet collected 9,356us-gaap_NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1 9,494us-gaap_NoncashOrPartNoncashDivestitureAmountOfConsiderationReceived1
Transfers of demonstration equipment to rental and lease equipment $ 1,998elrc_TransfersFromOtherAssetsToElectronicTestEquipment $ 2,149elrc_TransfersFromOtherAssetsToElectronicTestEquipment