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Foreign Revenues (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
China [Member]
Foreign revenues [Abstract]
Total foreign revenues	$ 235us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CN	$ 851us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_CN
Malaysia [Member]
Foreign revenues [Abstract]
Total foreign revenues	598us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_MY	798us-gaap_Revenues / us-gaap_StatementGeographicalAxis = country_MY
All other foreign countries [Member]
Foreign revenues [Abstract]
Total foreign revenues	623us-gaap_Revenues / us-gaap_StatementGeographicalAxis = lgl_AllOtherForeignCountriesMember	968us-gaap_Revenues / us-gaap_StatementGeographicalAxis = lgl_AllOtherForeignCountriesMember
Total Foreign Countries [Member]
Foreign revenues [Abstract]
Total foreign revenues	$ 1,456us-gaap_Revenues / us-gaap_StatementGeographicalAxis = lgl_TotalForeignCountriesMember	$ 2,617us-gaap_Revenues / us-gaap_StatementGeographicalAxis = lgl_TotalForeignCountriesMember

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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