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Segment Information (Continuing Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 segment	Mar. 31, 2014	Dec. 31, 2014
Net revenues	$ 1,885us-gaap_SalesRevenueNet	$ 1,702us-gaap_SalesRevenueNet
Interest income	1us-gaap_InvestmentIncomeInterest	1us-gaap_InvestmentIncomeInterest
Depreciation and amortization	88us-gaap_OtherDepreciationAndAmortization	33us-gaap_OtherDepreciationAndAmortization
Interest expense	4us-gaap_InterestExpenseDebt	2us-gaap_InterestExpenseDebt
Purchase of property and equipment	5us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	13us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Total assets	13,534us-gaap_Assets		13,764us-gaap_Assets
Income before income taxes	848us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	615us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Number of reportable segments	2us-gaap_NumberOfReportableSegments
Production Monitoring [Member]
Net revenues	1,885us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember	1,702us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Income before income taxes	32us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember	67us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Segment Investments [Member]
Income before income taxes	$ 816us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = else_SegmentInvestmentsMember	$ 548us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = else_SegmentInvestmentsMember

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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