Subsidiaries of the Registrant (Details)	6 Months Ended
	Jun. 30, 2015
M-tron Industries, Ltd. [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned By LGL (in hundredths)	99.90%
Piezo Technology, Inc. [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned By LGL (in hundredths)	100.00%
Piezo Technology India Private Ltd. [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned By LGL (in hundredths)	99.00%
M-tron Asia LLC [Member} [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned By LGL (in hundredths)	100.00%
M-tron Services Ltd [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned By LGL (in hundredths)	100.00%
Lynch Systems, Inc. [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned By LGL (in hundredths)	100.00%
M-tron Industries, Inc. [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned By LGL (in hundredths)	100.00%