Subsidiaries of the Registrant (Details)	3 Months Ended
	Jun. 30, 2016
M-tron Industries, Inc. [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 Industries, Ltd. [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%
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%