XML 52 R39.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Fair Value Measurements (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Equity Securities [Member] |  |
Assets measured at fair value on recurring basis [Abstract] |  |
Fair value assets | $ 2,770 | $ 56
U.S. Treasury Securities (Cash Equivalents) [Member] |  |
Assets measured at fair value on recurring basis [Abstract] |  |
Fair value assets | 1,002 | 4,089
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member] |  |
Assets measured at fair value on recurring basis [Abstract] |  |
Fair value assets | 2,770 | 56
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury Securities (Cash Equivalents) [Member] |  |
Assets measured at fair value on recurring basis [Abstract] |  |
Fair value assets | 1,002 | 4,089
Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member] |  |
Assets measured at fair value on recurring basis [Abstract] |  |
Fair value assets | 0 | 0
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Securities (Cash Equivalents) [Member] |  |
Assets measured at fair value on recurring basis [Abstract] |  |
Fair value assets | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member] |  |
Assets measured at fair value on recurring basis [Abstract] |  |
Fair value assets | 0 | 0
Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury Securities (Cash Equivalents) [Member] |  |
Assets measured at fair value on recurring basis [Abstract] |  |
Fair value assets | $ 0 | $ 0

X
- References No definition available. + Details
Name: | lgl_AssetsMeasuredAtFairValueOnRecurringBasisAbstract
Namespace Prefix: | lgl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
Name: | us-gaap_AssetsFairValueDisclosureRecurring
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |