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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Feb. 28, 2015
May 31, 2014
Statement of Financial Position [Abstract]    
Allowance for doubtful accounts $ 592us-gaap_AllowanceForDoubtfulAccountsReceivable $ 555us-gaap_AllowanceForDoubtfulAccountsReceivable
Accumulated depreciation on rental and lease equipment 241,431elrc_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentRentalAndLeaseEquipment 237,151elrc_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentRentalAndLeaseEquipment
Accumulated depreciation and amortization for other property 19,496elrc_AccumulatedDepreciationDepletionAndAmortizationOtherProperty 18,983elrc_AccumulatedDepreciationDepletionAndAmortizationOtherProperty
Accumulated amortization of intangibles $ 1,732us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization $ 1,632us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Preferred stock, par value $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued      
Common stock, par value      
Common stock, shares authorized 40,000,000us-gaap_CommonStockSharesAuthorized 40,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 24,104,834us-gaap_CommonStockSharesIssued 24,007,709us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 24,104,834us-gaap_CommonStockSharesOutstanding 24,007,709us-gaap_CommonStockSharesOutstanding