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Segment Information (Continuing Operating Segments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 segment	Dec. 31, 2013
Net revenues	$ 7,041us-gaap_SalesRevenueNet	$ 6,541us-gaap_SalesRevenueNet
Interest income	2us-gaap_InvestmentIncomeInterest	5us-gaap_InvestmentIncomeInterest
Depreciation and amortization	209us-gaap_OtherDepreciationAndAmortization	110us-gaap_OtherDepreciationAndAmortization
Interest expense	17us-gaap_InterestExpenseDebt	0us-gaap_InterestExpenseDebt
Purchase of property and equipment	46us-gaap_PaymentsToAcquirePropertyPlantAndEquipment	23us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Total assets	13,764us-gaap_Assets	12,609us-gaap_Assets
Income before income taxes	1,554us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	938us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Number of reportable segments	2us-gaap_NumberOfReportableSegments
Foreign Country Revenue [Member]
Net revenues	973us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = else_ForeignCountryRevenueMember	932us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = else_ForeignCountryRevenueMember
Production Monitoring [Member]
Net revenues	7,041us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember	6,541us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Interest income	0us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember	1us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Depreciation and amortization	209us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember	110us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Interest expense	17us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember	0us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Purchase of property and equipment	46us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember	23us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Total assets	4,945us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember	3,022us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Income before income taxes	389us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember	404us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Production Monitoring [Member] | Foreign Country Revenue [Member]
Net revenues	973us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember / us-gaap_StatementGeographicalAxis = else_ForeignCountryRevenueMember	932us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember / us-gaap_StatementGeographicalAxis = else_ForeignCountryRevenueMember
ESI Investment Company [Member]
Interest income	2us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = else_EsiInvestmentCompanyMember	4us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = else_EsiInvestmentCompanyMember
Total assets	8,819us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = else_EsiInvestmentCompanyMember	9,587us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = else_EsiInvestmentCompanyMember
Income before income taxes	$ 1,165us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = else_EsiInvestmentCompanyMember	$ 534us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = else_EsiInvestmentCompanyMember

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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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