Document And Entity Information (USD $)	12 Months Ended
	Dec. 31, 2011
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	No
Entity Filer Category	Smaller Reporting Company
Entity Public Float	$ 21,831,868
Entity Common Stock, Shares Outstanding	2,599,866
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2011