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Related Party Transactions (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) Director | Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items] |  |
Amount invested in Mutual Fund | $ 0 | $ 2,714
Amount invested in United States Treasury money market funds | $ 4,089 | $ 1,002
Number of common directors | Director | 1 |
Percentage of stockholders controlling a related party | 10.00% | 10.00%

X
- Definition The number of the entity's directors that also serve on a related entity's board. + References No definition available. + Details
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Namespace Prefix: | lgl_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Element represents the percentage of stockholders controlling a related party. + References No definition available. + Details
Name: | lgl_PercentageOfStockholderControllingRelatedParty
Namespace Prefix: | lgl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Investment in related party mutual fund. + References No definition available. + Details
Name: | lgl_RelatedPartyMutualFundInvestment
Namespace Prefix: | lgl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
Name: | us-gaap_MoneyMarketFundsAtCarryingValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration