3.20.1 html 113 334 1 true 36 0 false 6 false false R1.htm 00090 - Document - Document And Entity Information Sheet http://www.electro-sensors.com/role/DocumentDocumentAndEntityInformation Document And Entity Information Cover 1 false false R2.htm 00100 - Statement - Balance Sheets Sheet http://www.electro-sensors.com/role/StatementBalanceSheets Balance Sheets Statements 2 false false R3.htm 00105 - Statement - Balance Sheets (Parenthetical) Sheet http://www.electro-sensors.com/role/StatementBalanceSheetsParenthetical Balance Sheets (Parenthetical) Statements 3 false false R4.htm 00200 - Statement - Statements Of Comprehensive Income (Loss) Sheet http://www.electro-sensors.com/role/StatementsOfComprehensiveIncomeLoss Statements Of Comprehensive Income (Loss) Statements 4 false false R5.htm 00300 - Statement - Statements Of Changes In Stockholders' Equity Sheet http://www.electro-sensors.com/role/StatementStatementsOfChangesInStockholdersEquity Statements Of Changes In Stockholders' Equity Statements 5 false false R6.htm 00400 - Statement - Statements Of Cash Flows Sheet http://www.electro-sensors.com/role/StatementStatementsOfCashFlows Statements Of Cash Flows Statements 6 false false R7.htm 10101 - Disclosure - Nature of Business and Significant Accounting Policies Sheet http://www.electro-sensors.com/role/DisclosureNatureofBusinessandSignificantAccountingPolicies Nature of Business and Significant Accounting Policies Notes 7 false false R8.htm 10201 - Disclosure - Investments Sheet http://www.electro-sensors.com/role/DisclosureInvestments Investments Notes 8 false false R9.htm 10301 - Disclosure - Fair Value Measurements Sheet http://www.electro-sensors.com/role/DisclosureFairValueMeasurements Fair Value Measurements Notes 9 false false R10.htm 10401 - Disclosure - Inventories Sheet http://www.electro-sensors.com/role/DisclosureInventories Inventories Notes 10 false false R11.htm 10501 - Disclosure - Property And Equipment, Net Sheet http://www.electro-sensors.com/role/DisclosurePropertyAndEquipmentNet Property And Equipment, Net Notes 11 false false R12.htm 10601 - Disclosure - Net Intangible Assets Sheet http://www.electro-sensors.com/role/DisclosureNetIntangibleAssets Net Intangible Assets Notes 12 false false R13.htm 10701 - Disclosure - Accrued Expenses Sheet http://www.electro-sensors.com/role/DisclosureAccruedExpenses Accrued Expenses Notes 13 false false R14.htm 10801 - Disclosure - Leases Sheet http://www.electro-sensors.com/role/DisclosureLeases Leases Notes 14 false false R15.htm 10901 - Disclosure - Common Stock Options Sheet http://www.electro-sensors.com/role/DisclosureCommonStockOptions Common Stock Options Notes 15 false false R16.htm 11001 - Disclosure - Benefit Plans Sheet http://www.electro-sensors.com/role/DisclosureBenefitPlans Benefit Plans Notes 16 false false R17.htm 11101 - Disclosure - Income Taxes Sheet http://www.electro-sensors.com/role/DisclosureIncomeTaxes Income Taxes Notes 17 false false R18.htm 20102 - Disclosure - Nature of Business and Significant Accounting Policies (Policy) Sheet http://www.electro-sensors.com/role/DisclosureNatureofBusinessandSignificantAccountingPoliciesPolicy Nature of Business and Significant Accounting Policies (Policy) Policies http://www.electro-sensors.com/role/DisclosureNatureofBusinessandSignificantAccountingPolicies 18 false false R19.htm 30103 - Disclosure - Nature of Business and Significant Accounting Policies (Tables) Sheet http://www.electro-sensors.com/role/DisclosureNatureofBusinessandSignificantAccountingPoliciesTables Nature of Business and Significant Accounting Policies (Tables) Tables http://www.electro-sensors.com/role/DisclosureNatureofBusinessandSignificantAccountingPolicies 19 false false R20.htm 30203 - Disclosure - Investments (Tables) Sheet http://www.electro-sensors.com/role/DisclosureInvestmentsTables Investments (Tables) Tables http://www.electro-sensors.com/role/DisclosureInvestments 20 false false R21.htm 30303 - Disclosure - Fair Value Measurements (Tables) Sheet http://www.electro-sensors.com/role/DisclosureFairValueMeasurementsTables Fair Value Measurements (Tables) Tables http://www.electro-sensors.com/role/DisclosureFairValueMeasurements 21 false false R22.htm 30403 - Disclosure - Inventories (Tables) Sheet http://www.electro-sensors.com/role/DisclosureInventoriesTables Inventories (Tables) Tables http://www.electro-sensors.com/role/DisclosureInventories 22 false false R23.htm 30503 - Disclosure - Property And Equipment, Net (Tables) Sheet http://www.electro-sensors.com/role/DisclosurePropertyAndEquipmentNetTables Property And Equipment, Net (Tables) Tables http://www.electro-sensors.com/role/DisclosurePropertyAndEquipmentNet 23 false false R24.htm 30603 - Disclosure - Net Intangible Assets (Tables) Sheet http://www.electro-sensors.com/role/DisclosureNetIntangibleAssetsTables Net Intangible Assets (Tables) Tables http://www.electro-sensors.com/role/DisclosureNetIntangibleAssets 24 false false R25.htm 30703 - Disclosure - Accrued Expenses (Tables) Sheet http://www.electro-sensors.com/role/DisclosureAccruedExpensesTables Accrued Expenses (Tables) Tables http://www.electro-sensors.com/role/DisclosureAccruedExpenses 25 false false R26.htm 30803 - Disclosure - Leases (Tables) Sheet http://www.electro-sensors.com/role/DisclosureLeasesTables Leases (Tables) Tables http://www.electro-sensors.com/role/DisclosureLeases 26 false false R27.htm 30902 - Disclosure - Common Stock Options (Tables) Sheet http://www.electro-sensors.com/role/CommonStockOptionsTables Common Stock Options (Tables) Tables http://www.electro-sensors.com/role/DisclosureCommonStockOptions 27 false false R28.htm 31103 - Disclosure - Income Taxes (Tables) Sheet http://www.electro-sensors.com/role/DisclosureIncomeTaxesTables Income Taxes (Tables) Tables http://www.electro-sensors.com/role/DisclosureIncomeTaxes 28 false false R29.htm 40101 - Disclosure - Nature Of Business And Significant Accounting Policies (Narrative) (Details) Sheet http://www.electro-sensors.com/role/DisclosureNatureOfBusinessAndSignificantAccountingPoliciesNarrativeDetails Nature Of Business And Significant Accounting Policies (Narrative) (Details) Details 29 false false R30.htm 40102 - Disclosure - Nature Of Business And Significant Accounting Policies (Schedule Of Estimated Useful Lives) (Details) Sheet http://www.electro-sensors.com/role/DisclosureNatureOfBusinessAndSignificantAccountingPoliciesScheduleOfEstimatedUsefulLivesDetails Nature Of Business And Significant Accounting Policies (Schedule Of Estimated Useful Lives) (Details) Details 30 false false R31.htm 40103 - Disclosure - Nature Of Business And Significant Accounting Policies (Schedule Of Net Income (Loss) Per Common Share) (Details) Sheet http://www.electro-sensors.com/role/NatureOfBusinessAndSignificantAccountingPoliciesScheduleOfNetIncomeLossPerCommonShareDetails Nature Of Business And Significant Accounting Policies (Schedule Of Net Income (Loss) Per Common Share) (Details) Details 31 false false R32.htm 40201 - Disclosure - Investments (Narrative) (Details) Sheet http://www.electro-sensors.com/role/DisclosureInvestmentsNarrativeDetails Investments (Narrative) (Details) Details http://www.electro-sensors.com/role/DisclosureInvestmentsTables 32 false false R33.htm 40202 - Disclosure - Investments (Cost And Estimated Fair Value Of Investments) (Details) Sheet http://www.electro-sensors.com/role/DisclosureInvestmentsCostAndEstimatedFairValueOfInvestmentsDetails Investments (Cost And Estimated Fair Value Of Investments) (Details) Details http://www.electro-sensors.com/role/DisclosureInvestmentsTables 33 false false R34.htm 40204 - Disclosure - Investments (Schedule Of Changes In Accumulated Other Comprehensive Income) (Details) Sheet http://www.electro-sensors.com/role/InvestmentsScheduleOfChangesInAccumulatedOtherComprehensiveIncomeDetails Investments (Schedule Of Changes In Accumulated Other Comprehensive Income) (Details) Details http://www.electro-sensors.com/role/DisclosureInvestmentsTables 34 false false R35.htm 40301 - Disclosure - Fair Value Measurements (Fair Value Measurements On A Recurring Basis) (Details) Sheet http://www.electro-sensors.com/role/DisclosureFairValueMeasurementsFairValueMeasurementsOnRecurringBasisDetails Fair Value Measurements (Fair Value Measurements On A Recurring Basis) (Details) Details http://www.electro-sensors.com/role/DisclosureFairValueMeasurementsTables 35 false false R36.htm 40302 - Disclosure - Fair Value Measurements (Fair Value Assets Measured on Recurring Basis Unobservable Inputs Reconciliation) (Details) Sheet http://www.electro-sensors.com/role/DisclosureFairValueMeasurementsFairValueAssetsMeasuredonRecurringBasisUnobservableInputsReconciliationDetails Fair Value Measurements (Fair Value Assets Measured on Recurring Basis Unobservable Inputs Reconciliation) (Details) Details http://www.electro-sensors.com/role/DisclosureFairValueMeasurementsTables 36 false false R37.htm 40303 - Disclosure - Fair Value Measurements (Fair Value Liabilities Measured on Recurring Basis Unobservable Inputs Reconciliation) (Details) Sheet http://www.electro-sensors.com/role/DisclosureFairValueMeasurementsFairValueLiabilitiesMeasuredonRecurringBasisUnobservableInputsReconciliationDetails Fair Value Measurements (Fair Value Liabilities Measured on Recurring Basis Unobservable Inputs Reconciliation) (Details) Details http://www.electro-sensors.com/role/DisclosureFairValueMeasurementsTables 37 false false R38.htm 40401 - Disclosure - Inventories (Details) Sheet http://www.electro-sensors.com/role/DisclosureInventoriesDetails Inventories (Details) Details http://www.electro-sensors.com/role/DisclosureInventoriesTables 38 false false R39.htm 40501 - Disclosure - Property And Equipment, Net (Narrative) (Details) Sheet http://www.electro-sensors.com/role/DisclosurePropertyAndEquipmentNetNarrativeDetails Property And Equipment, Net (Narrative) (Details) Details http://www.electro-sensors.com/role/DisclosurePropertyAndEquipmentNetTables 39 false false R40.htm 40502 - Disclosure - Property And Equipment, Net (Details) Sheet http://www.electro-sensors.com/role/DisclosurePropertyAndEquipmentNetDetails Property And Equipment, Net (Details) Details http://www.electro-sensors.com/role/DisclosurePropertyAndEquipmentNetTables 40 false false R41.htm 40601 - Disclosure - Net Intangible Assets (Schedule of Finite Lived Intangible Assets) (Details) Sheet http://www.electro-sensors.com/role/NetIntangibleAssetsScheduleofFiniteLivedIntangibleAssetsDetails Net Intangible Assets (Schedule of Finite Lived Intangible Assets) (Details) Details http://www.electro-sensors.com/role/DisclosureNetIntangibleAssetsTables 41 false false R42.htm 40602 - Disclosure - Net Intangible Assets (Schedule of estimated amortization expense) (Details) Sheet http://www.electro-sensors.com/role/NetIntangibleAssetsScheduleofestimatedamortizationexpenseDetails Net Intangible Assets (Schedule of estimated amortization expense) (Details) Details http://www.electro-sensors.com/role/DisclosureNetIntangibleAssetsTables 42 false false R43.htm 40701 - Disclosure - Accrued Expenses (Details) Sheet http://www.electro-sensors.com/role/DisclosureAccruedExpensesDetails Accrued Expenses (Details) Details http://www.electro-sensors.com/role/DisclosureAccruedExpensesTables 43 false false R44.htm 40801 - Disclosure - Leases (Schedule of components of lease expense) (Details) Sheet http://www.electro-sensors.com/role/LeasesScheduleofcomponentsofleaseexpenseDetails Leases (Schedule of components of lease expense) (Details) Details http://www.electro-sensors.com/role/DisclosureLeasesTables 44 false false R45.htm 40802 - Disclosure - Leases (Schedule of supplemental balance sheet information related to leases) (Details) Sheet http://www.electro-sensors.com/role/LeasesScheduleofsupplementalbalancesheetinformationrelatedtoleasesDetails Leases (Schedule of supplemental balance sheet information related to leases) (Details) Details http://www.electro-sensors.com/role/DisclosureLeasesTables 45 false false R46.htm 40803 - Disclosure - Leases (Schedule of maturities of lease liabilities) (Details) Sheet http://www.electro-sensors.com/role/LeasesScheduleofmaturitiesofleaseliabilitiesDetails Leases (Schedule of maturities of lease liabilities) (Details) Details http://www.electro-sensors.com/role/DisclosureLeasesTables 46 false false R47.htm 40901 - Disclosure - Common Stock Options (Valuation Assumptions) (Details) Sheet http://www.electro-sensors.com/role/DisclosureCommonStockOptionsValuationAssumptionsDetails Common Stock Options (Valuation Assumptions) (Details) Details http://www.electro-sensors.com/role/CommonStockOptionsTables 47 false false R48.htm 40902 - Disclosure - Common Stock Options (Narrative) (Details) Sheet http://www.electro-sensors.com/role/DisclosureCommonStockOptionsNarrativeDetails Common Stock Options (Narrative) (Details) Details http://www.electro-sensors.com/role/CommonStockOptionsTables 48 false false R49.htm 40903 - Disclosure - Common Stock Options (Schedule Of Stock Options Activity) (Details) Sheet http://www.electro-sensors.com/role/DisclosureCommonStockOptionsScheduleOfStockOptionsActivityDetails Common Stock Options (Schedule Of Stock Options Activity) (Details) Details http://www.electro-sensors.com/role/CommonStockOptionsTables 49 false false R50.htm 41001 - Disclosure - Benefit Plans (Details) Sheet http://www.electro-sensors.com/role/DisclosureBenefitPlansDetails Benefit Plans (Details) Details http://www.electro-sensors.com/role/DisclosureBenefitPlans 50 false false R51.htm 41101 - Disclosure - Income Taxes (Schedule Of Components Of The Income Tax Provision) (Details) Sheet http://www.electro-sensors.com/role/DisclosureIncomeTaxesScheduleOfComponentsOfIncomeTaxProvisionDetails Income Taxes (Schedule Of Components Of The Income Tax Provision) (Details) Details http://www.electro-sensors.com/role/DisclosureIncomeTaxesTables 51 false false R52.htm 41102 - Disclosure - Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) Sheet http://www.electro-sensors.com/role/DisclosureIncomeTaxesScheduleOfEffectiveIncomeTaxRateReconciliationDetails Income Taxes (Schedule Of Effective Income Tax Rate Reconciliation) (Details) Details http://www.electro-sensors.com/role/DisclosureIncomeTaxesTables 52 false false R53.htm 41103 - Disclosure - Income Taxes (Schedule Of Net Deferred Tax Assets and Liabilities) (Details) Sheet http://www.electro-sensors.com/role/DisclosureIncomeTaxesScheduleOfNetDeferredTaxAssetsAndLiabilitiesDetails Income Taxes (Schedule Of Net Deferred Tax Assets and Liabilities) (Details) Details http://www.electro-sensors.com/role/DisclosureIncomeTaxesTables 53 false false All Reports Book All Reports else-20191231.htm else-20191231.xsd else-20191231_cal.xml else-20191231_def.xml else-20191231_lab.xml else-20191231_pre.xml ex231_2.htm ex311_3.htm ex321_4.htm ex41_1.htm ex991_5.htm ex992_6.htm imggsxuatp454d11172250.jpg http://fasb.org/us-gaap/2019-01-31 http://fasb.org/srt/2019-01-31 http://xbrl.sec.gov/dei/2019-01-31 true true