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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 | $ 7,041 us-gaap_SalesRevenueNet | $ 6,541 us-gaap_SalesRevenueNet
Interest income | 2 us-gaap_InvestmentIncomeInterest | 5 us-gaap_InvestmentIncomeInterest
Depreciation and amortization | 209 us-gaap_OtherDepreciationAndAmortization | 110 us-gaap_OtherDepreciationAndAmortization
Interest expense | 17 us-gaap_InterestExpenseDebt | 0 us-gaap_InterestExpenseDebt
Purchase of property and equipment | 46 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | 23 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Total assets | 13,764 us-gaap_Assets | 12,609 us-gaap_Assets
Income before income taxes | 1,554 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 938 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Number of reportable segments | 2 us-gaap_NumberOfReportableSegments |
Foreign Country Revenue [Member] |  |
Net revenues | 973 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = else_ForeignCountryRevenueMember | 932 us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = else_ForeignCountryRevenueMember
Production Monitoring [Member] |  |
Net revenues | 7,041 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember | 6,541 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Interest income | 0 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember | 1 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Depreciation and amortization | 209 us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember | 110 us-gaap_OtherDepreciationAndAmortization / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Interest expense | 17 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember | 0 us-gaap_InterestExpenseDebt / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Purchase of property and equipment | 46 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember | 23 us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Total assets | 4,945 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember | 3,022 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Income before income taxes | 389 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember | 404 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember
Production Monitoring [Member] | Foreign Country Revenue [Member] |  |
Net revenues | 973 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember / us-gaap_StatementGeographicalAxis = else_ForeignCountryRevenueMember | 932 us-gaap_SalesRevenueNet / us-gaap_StatementBusinessSegmentsAxis = else_ProductionMonitoringMember / us-gaap_StatementGeographicalAxis = else_ForeignCountryRevenueMember
ESI Investment Company [Member] |  |
Interest income | 2 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = else_EsiInvestmentCompanyMember | 4 us-gaap_InvestmentIncomeInterest / us-gaap_StatementBusinessSegmentsAxis = else_EsiInvestmentCompanyMember
Total assets | 8,819 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = else_EsiInvestmentCompanyMember | 9,587 us-gaap_Assets / us-gaap_StatementBusinessSegmentsAxis = else_EsiInvestmentCompanyMember
Income before income taxes | $ 1,165 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = else_EsiInvestmentCompanyMember | $ 534 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementBusinessSegmentsAxis = else_EsiInvestmentCompanyMember

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.18) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 18 -Article 5 + Details
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- Definition Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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