• Filing Date: 2019-03-21
  • Form Type: 10-K
  • Description: Annual report
v3.19.1
Document and Entity Information - USD ($)
12 Months Ended
Dec. 31, 2018
Mar. 12, 2019
Jun. 30, 2018
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 Non-accelerated Filer    
Entity Public Float     $ 20,791,812
Entity Common Stock, Shares Outstanding   4,831,178  
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2018    
Entity Small Business true    
Entity Shell Company false    
Entity Emerging Growth Company false