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Subsidiaries of the Registrant (Details)	3 Months Ended
	Mar. 31, 2016
M-tron Industries, Ltd. [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned by LGL	100.00%
Piezo Technology, Inc. [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned by LGL	100.00%
Piezo Technology India Private Ltd. [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned by LGL	99.00%
M-tron Asia LLC [Member} [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned by LGL	100.00%
M-tron Services Ltd [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned by LGL	100.00%
Lynch Systems, Inc. [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned by LGL	100.00%
M-tron Industries, Inc. [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned by LGL	100.00%
GC Opportunities Ltd. [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned by LGL	100.00%

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- Definition

Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions.

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Name:	dei_LegalEntityAxis=lgl_PiezoTechnologyIncMember
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Name:	dei_LegalEntityAxis=lgl_PiezoTechnologyIndiaPrivateLtdMember
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Name:	dei_LegalEntityAxis=lgl_MTronAsiaLlcMemberMember
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