Document and Entity Information (USD $)	9 Months Ended
	Sep. 30, 2012	Nov. 12, 2012	Jun. 30, 2011
Document and Entity Information [Abstract]
Entity Registrant Name	LGL Group Inc
Entity Central Index Key	0000061004
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$ 21,831,868
Entity Common Stock, Shares Outstanding		2,634,409
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2012