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Document and Entity Information (USD $)
 3 Months Ended
Mar. 31, 2015
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 $ 0dei_EntityPublicFloat
Entity Common Stock, Shares Outstanding 0dei_EntityCommonStockSharesOutstanding
Document Fiscal Year Focus 2015
Document Fiscal Period Focus Q1
Document Type 10-Q
Amendment Flag false
Document Period End Date Mar. 31, 2015