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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Operating Loss Carryforwards [Line Items]    
Provision (benefit) for income taxes $ (4,000)us-gaap_IncomeTaxExpenseBenefit $ 3,948,000us-gaap_IncomeTaxExpenseBenefit
Tax Credit Carryforward [Line Items]    
Alternative minimum tax 111,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax  
Expiration date Dec. 31, 2034  
Deferred tax assets [Abstract]    
Inventory reserve 1,151,000us-gaap_DeferredTaxAssetsInventory 996,000us-gaap_DeferredTaxAssetsInventory
Fixed assets 0lgl_FixedAssetRelatedDeferredTaxAssetLiability 0lgl_FixedAssetRelatedDeferredTaxAssetLiability
Other reserves and accruals 109,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther 90,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther
Stock-based compensation 367,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost 295,000us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Undistributed foreign earnings 0lgl_UndistributedForeignEarningsDeferredTaxAssetLiability 0lgl_UndistributedForeignEarningsDeferredTaxAssetLiability
Other 1,000lgl_OtherDeferredTaxAssetLiability 0lgl_OtherDeferredTaxAssetLiability
Tax credit carry-forwards 1,755,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards 1,648,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwards
Federal tax loss carry-forwards 3,220,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 2,586,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
State tax loss carry-forwards 901,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 541,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Foreign tax loss carry-forwards 268,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 276,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Total deferred income tax assets 7,772,000us-gaap_DeferredTaxAssetsGross 6,432,000us-gaap_DeferredTaxAssetsGross
Valuation allowance (7,326,000)us-gaap_DeferredTaxAssetsValuationAllowance (5,968,000)us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred 0us-gaap_DeferredTaxAssetsNet 0us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities [Abstract]    
Deferred Tax Liability Inventory 0lgl_DeferredTaxLiabilityInventory 0lgl_DeferredTaxLiabilityInventory
Fixed assets 285,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment 375,000us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Deferred Tax Liability Other Accruals 0lgl_DeferredTaxLiabilityOtherAccruals 0lgl_DeferredTaxLiabilityOtherAccruals
Deferred Tax Liability, Stock-Based Compensation 0lgl_DeferredTaxLiabilityStockBasedCompensation 0lgl_DeferredTaxLiabilityStockBasedCompensation
Undistributed foreign earnings 86,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 14,000us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Other 75,000us-gaap_DeferredTaxLiabilitiesOther 75,000us-gaap_DeferredTaxLiabilitiesOther
Total deferred income tax liabilities 446,000us-gaap_DeferredIncomeTaxLiabilities 464,000us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets (liabilities), net 0us-gaap_DeferredTaxAssetsLiabilitiesNet 0us-gaap_DeferredTaxAssetsLiabilitiesNet
Current:    
Federal 0us-gaap_CurrentFederalTaxExpenseBenefit 0us-gaap_CurrentFederalTaxExpenseBenefit
State and local 5,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit 3,000us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Foreign (9,000)us-gaap_CurrentForeignTaxExpenseBenefit 23,000us-gaap_CurrentForeignTaxExpenseBenefit
Total Current (4,000)us-gaap_CurrentIncomeTaxExpenseBenefit 26,000us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred:    
Federal (985,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (1,463,000)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
State and local (381,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit (51,000)us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Deferred Foreign Income Tax Expense (Benefit) 8,000us-gaap_DeferredForeignIncomeTaxExpenseBenefit (225,000)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total before change in valuation allowance (1,358,000)lgl_TotalBeforeChangeInValuationAllowance (1,739,000)lgl_TotalBeforeChangeInValuationAllowance
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance 1,358,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 5,661,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Net deferred 0us-gaap_DeferredIncomeTaxExpenseBenefit 3,922,000us-gaap_DeferredIncomeTaxExpenseBenefit
Reconciliation of provision (benefit) for income taxes [Abstract]    
Tax provision at expected statutory rate (962,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate (1,452,000)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
State taxes, net of federal benefit (57,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes (38,000)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Permanent differences (5,000)us-gaap_IncomeTaxReconciliationNondeductibleExpense 25,000us-gaap_IncomeTaxReconciliationNondeductibleExpense
Credits (56,000)us-gaap_IncomeTaxReconciliationTaxCredits (184,000)us-gaap_IncomeTaxReconciliationTaxCredits
Foreign tax expense, and other (282,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential (64,000)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Change in valuation allowance for utilization of Georgia State net operating loss 1,358,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance 5,661,000us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Provision (benefit) for income taxes (4,000)us-gaap_IncomeTaxExpenseBenefit 3,948,000us-gaap_IncomeTaxExpenseBenefit
(Loss) income before income taxes from domestic operations (2,832,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic (2,872,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Profit before income taxes from foreign operations 4,000us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign (1,399,000)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Earnings of Company's foreign subsidiaries not considered to be indefinitely reinvested (47,000)lgl_EarningsOfForeignSubsidiariesNotConsideredToBeIndefinitelyReinvested  
Earnings of non-U.S. subsidiaries considered to be indefinitely reinvested 509,000us-gaap_UndistributedEarningsOfForeignSubsidiaries  
Research and Development Credit Carryforwards [Member]    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward amount 1,285,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= us-gaap_ResearchMember		  
Expiration date Dec. 31, 2034  
Foreign Tax Credit Carryforward [Member]    
Tax Credit Carryforward [Line Items]    
Tax credit carryforward amount 359,000us-gaap_TaxCreditCarryforwardAmount
/ us-gaap_TaxCreditCarryforwardAxis
= lgl_ForeignTaxCreditCarryforwardMember		  
Expiration date Dec. 31, 2020  
Federal [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards 9,471,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember		  
State [Member]    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards $ 21,780,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember