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Investments (Cost And Estimated Fair Value Of Investments) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 6,614,000us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 5,312,000us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross unrealized gain	1,238,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains	2,687,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Gross unrealized loss	54,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss	54,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Fair value, investments	7,798,000us-gaap_AvailableForSaleSecurities	7,945,000us-gaap_AvailableForSaleSecurities
Less cash equivalents, Carrying amount	1,190,000us-gaap_CashAndCashEquivalentsAtCarryingValue	1,505,000us-gaap_CashAndCashEquivalentsAtCarryingValue	1,102,000us-gaap_CashAndCashEquivalentsAtCarryingValue
Money Market [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	510,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember	540,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember
Gross unrealized gain	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember
Gross unrealized loss	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember
Fair value, investments	510,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember	540,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_MoneyMarketFundsMember
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	345,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember	601,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Gross unrealized gain	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Gross unrealized loss	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Fair value, investments	345,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember	601,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_CommercialPaperMember
Treasury Bills [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	6,542,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember	5,226,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Gross unrealized gain	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember	1,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Gross unrealized loss	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Fair value, investments	6,542,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember	5,227,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_USTreasurySecuritiesMember
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	72,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	86,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Gross unrealized gain	1,238,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	2,686,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Gross unrealized loss	54,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	54,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Fair value, investments	1,256,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember	2,718,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = us-gaap_EquitySecuritiesMember
Debt and Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	7,469,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = else_DebtAndEquitySecuritiesMember	6,453,000us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = else_DebtAndEquitySecuritiesMember
Gross unrealized gain	1,238,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = else_DebtAndEquitySecuritiesMember	2,687,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = else_DebtAndEquitySecuritiesMember
Gross unrealized loss	54,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = else_DebtAndEquitySecuritiesMember	54,000us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = else_DebtAndEquitySecuritiesMember
Fair value, investments	8,653,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = else_DebtAndEquitySecuritiesMember	9,086,000us-gaap_AvailableForSaleSecurities / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = else_DebtAndEquitySecuritiesMember
Less Cash Equivalents [Member]
Schedule of Available-for-sale Securities [Line Items]
Gross unrealized gain	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember
Gross unrealized loss	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember
Less cash equivalents, Carrying amount	855,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember	1,141,000us-gaap_CashAndCashEquivalentsAtCarryingValue / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember
Less cash equivalents, Fair value	$ 855,000us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember	$ 1,141,000us-gaap_CashAndCashEquivalentsFairValueDisclosure / us-gaap_InvestmentTypeAxis = us-gaap_CashAndCashEquivalentsMember

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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