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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
OPERATING ACTIVITIES    
Net loss $ (2,825)us-gaap_NetIncomeLoss $ (8,219)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash used in operating activities:    
Depreciation 821us-gaap_Depreciation 913us-gaap_Depreciation
Amortization of finite-lived intangible assets 101us-gaap_AmortizationOfIntangibleAssets 77us-gaap_AmortizationOfIntangibleAssets
Impairment of property, plant and equipment 0lgl_ImpairmentOfPropertyPlantAndEquipment 228lgl_ImpairmentOfPropertyPlantAndEquipment
Write-down of note receivable 0lgl_ImpairmentOfNoteReceivable 11lgl_ImpairmentOfNoteReceivable
Stock-based compensation 308us-gaap_ShareBasedCompensation 575us-gaap_ShareBasedCompensation
Deferred income tax provision 0us-gaap_DeferredIncomeTaxExpenseBenefit 3,922us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in operating assets and liabilities:    
(Increase) decrease in accounts receivable, net (29)us-gaap_IncreaseDecreaseInAccountsReceivable 1,113us-gaap_IncreaseDecreaseInAccountsReceivable
Decrease in inventories, net 523us-gaap_IncreaseDecreaseInInventories 720us-gaap_IncreaseDecreaseInInventories
Decrease in other assets 104us-gaap_IncreaseDecreaseInOtherOperatingAssets 341us-gaap_IncreaseDecreaseInOtherOperatingAssets
Decrease in trade accounts payable, accrued compensation and commissions expense and other accrued liabilities (302)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities (345)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Net cash used in operating activities (1,299)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations (664)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
INVESTING ACTIVITIES    
Capital expenditures (263)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (448)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Asset acquisition (748)us-gaap_PaymentsToAcquireOtherProductiveAssets 0us-gaap_PaymentsToAcquireOtherProductiveAssets
Proceeds from disposal of property, plant and equipment 0us-gaap_ProceedsFromSaleOfOtherPropertyPlantAndEquipment 28us-gaap_ProceedsFromSaleOfOtherPropertyPlantAndEquipment
Net cash used in investing activities (1,011)us-gaap_NetCashProvidedByUsedInInvestingActivities (420)us-gaap_NetCashProvidedByUsedInInvestingActivities
FINANCING ACTIVITIES    
Net repayments on note payable to bank (1,181)us-gaap_RepaymentsOfNotesPayable (68)us-gaap_RepaymentsOfNotesPayable
Restricted cash 1,500us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities 0us-gaap_ProceedsFromRepaymentsOfRestrictedCashFinancingActivities
Purchase of treasury stock 0us-gaap_PaymentsForRepurchaseOfCommonStock (167)us-gaap_PaymentsForRepurchaseOfCommonStock
Warrant dividend issuance costs 0lgl_WarrantDividendIssuanceCosts (65)lgl_WarrantDividendIssuanceCosts
Principal payments of long-term debt 0us-gaap_RepaymentsOfLongTermDebt (58)us-gaap_RepaymentsOfLongTermDebt
Net cash provided by (used in) financing activities 319us-gaap_NetCashProvidedByUsedInFinancingActivities (358)us-gaap_NetCashProvidedByUsedInFinancingActivities
Decrease in cash and cash equivalents (1,991)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,442)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 7,183us-gaap_CashAndCashEquivalentsAtCarryingValue 8,625us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period 5,192us-gaap_CashAndCashEquivalentsAtCarryingValue 7,183us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosure:    
Cash paid for interest 32us-gaap_IncomeTaxesPaid 36us-gaap_IncomeTaxesPaid
Cash paid for income taxes $ 0us-gaap_InterestPaid $ 21us-gaap_InterestPaid