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v2.4.1.9

Commitments and Contingencies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Operating Leased Assets [Line Items] |  |
Rent expense under operating leases | $ 295,000 us-gaap_OperatingLeasesRentExpenseNet | $ 377,000 us-gaap_OperatingLeasesRentExpenseNet
Minimum [Member] |  |
Operating Leased Assets [Line Items] |  |
Term of operating leases | 1 year |
Maximum [Member] |  |
Operating Leased Assets [Line Items] |  |
Term of operating leases | 2 years |

X
- Definition This element represents the term of operating leases. + References No definition available. + Details
Name: | lgl_OperatingLeasesTerm
Namespace Prefix: | lgl_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_OperatingLeasedAssetsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41499-112717 + Details
Name: | us-gaap_OperatingLeasesRentExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |