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CONSOLIDATED BALANCE SHEETS (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2015
May 31, 2014
Assets    
Cash $ 8,133us-gaap_CashAndCashEquivalentsAtCarryingValue $ 5,946us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net of allowance for doubtful accounts of $592 and $555 32,046us-gaap_AccountsReceivableNet 34,970us-gaap_AccountsReceivableNet
Rental and lease equipment, net of accumulated depreciation of $241,431 and $237,151 216,841elrc_ElectronicTestEquipment 221,888elrc_ElectronicTestEquipment
Other property, net of accumulated depreciation and amortization of $19,496 and $18,983 13,317us-gaap_PropertyPlantAndEquipmentNet 13,122us-gaap_PropertyPlantAndEquipmentNet
Goodwill 3,109us-gaap_Goodwill 3,109us-gaap_Goodwill
Intangibles, net of accumulated amortization of $1,732 and $1,632 773us-gaap_IntangibleAssetsNetExcludingGoodwill 873us-gaap_IntangibleAssetsNetExcludingGoodwill
Other assets 27,508us-gaap_OtherAssets 22,150us-gaap_OtherAssets
Total assets 301,727us-gaap_Assets 302,058us-gaap_Assets
Liabilities:    
Bank borrowings 0us-gaap_LoansPayableToBank 0us-gaap_LoansPayableToBank
Accounts payable 7,563us-gaap_AccountsPayableCurrentAndNoncurrent 7,279us-gaap_AccountsPayableCurrentAndNoncurrent
Accrued expenses 14,625us-gaap_AccruedLiabilitiesCurrentAndNoncurrent 14,472us-gaap_AccruedLiabilitiesCurrentAndNoncurrent
Deferred revenue 6,159us-gaap_DeferredRevenue 7,537us-gaap_DeferredRevenue
Deferred tax liability 44,259us-gaap_DeferredIncomeTaxLiabilities 41,812us-gaap_DeferredIncomeTaxLiabilities
Total liabilities 72,606us-gaap_Liabilities 71,100us-gaap_Liabilities
Commitments and contingencies      
Shareholders’ equity:    
Preferred stock, $1 par - shares authorized 1,000,000, none issued 0us-gaap_PreferredStockValue 0us-gaap_PreferredStockValue
Common stock, no par - shares authorized 40,000,000; issued and outstanding February 28, 2015 - 24,104,834; May 31, 2014 - 24,007,709 40,123us-gaap_CommonStockValue 39,252us-gaap_CommonStockValue
Retained earnings 188,998us-gaap_RetainedEarningsAccumulatedDeficit 191,706us-gaap_RetainedEarningsAccumulatedDeficit
Total shareholders’ equity 229,121us-gaap_StockholdersEquity 230,958us-gaap_StockholdersEquity
Total liabilities and shareholders' equity $ 301,727us-gaap_LiabilitiesAndStockholdersEquity $ 302,058us-gaap_LiabilitiesAndStockholdersEquity