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v2.4.1.9

Notes Payable to Bank and Long-Term Debt (Details) (USD $) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Notes Payable: |  |
MtronPTI revolving loan with J.P. Morgan Chase Bank, N.A. | $ 0 us-gaap_NotesPayableToBankCurrent | $ 1,181,000 us-gaap_NotesPayableToBankCurrent
J.P. Morgan Chase Bank [Member] |  |
Notes Payable: |  |
Debt Instrument, Maturity Date | Sep. 30, 2014 |
Line of Credit Facility [Abstract] | 1,500,000 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_LineOfCreditFacilityAxis = lgl_JPMorganChaseBankMember |
Termination Date | Aug. 29, 2014 |
Collateral deposit | 1,500,000 us-gaap_DepositAssets / us-gaap_LineOfCreditFacilityAxis = lgl_JPMorganChaseBankMember |
LGL_CityNationalBank [Member] |  |
Notes Payable: |  |
Debt instrument, LIBOR reference rate | 30 days |
Revolving Loan, Interest Rate at Period End | 2.00%lgl_RevolvingLoanInterestRateAtPeriodEnd / us-gaap_LineOfCreditFacilityAxis = lgl_LglCitynationalbankMember |
Debt Instrument, Maturity Date | Sep. 30, 2016 |
Line of Credit Facility [Abstract] | $ 3,000,000 us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod / us-gaap_LineOfCreditFacilityAxis = lgl_LglCitynationalbankMember |
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage | 0.75%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_LineOfCreditFacilityAxis = lgl_LglCitynationalbankMember |

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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Namespace Prefix: | lgl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The effective interest rate at the end of the reporting period. + References No definition available. + Details
Name: | lgl_RevolvingLoanInterestRateAtPeriodEnd
Namespace Prefix: | lgl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Debt agreement termination date. + References No definition available. + Details
Name: | lgl_TerminationDate
Namespace Prefix: | lgl_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying amount of the asset transferred to a third party to serve as a deposit, which typically serves as security against failure by the transferor to perform under terms of an agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 17 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maximum amount borrowed under the credit facility at any time during the period. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityMaximumAmountOutstandingDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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X
- Definition Current portion of the total carrying amount as of the balance sheet date due within one year or the operating cycle, if longer, on all notes payable to banks paid on an installment with long term maturities. This can include the amount of any loans from the applicant firm. This does not, however, include any mortgage balances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(1),20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |