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Document and Entity Information (USD $)
 6 Months Ended
Jun. 30, 2014
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 $ 11,024,000
Entity Common Stock, Shares Outstanding 2,594,732
Document Fiscal Year Focus 2014
Document Fiscal Period Focus Q2
Document Type 10-Q
Amendment Flag false
Document Period End Date Jun. 30, 2014