Accounting And Reporting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Revenues [Member] Independent contract manufacturer with production locations in both Korea and China [Member] Manufacturer	Dec. 31, 2012 Revenues [Member] Independent contract manufacturer with production locations in both Korea and China [Member] Manufacturer	Dec. 31, 2013 Revenues [Member] Customer Concentration Risk [Member]	Dec. 31, 2012 Revenues [Member] Customer Concentration Risk [Member]	Dec. 31, 2013 Accounts Receivable [Member] Customer Concentration Risk [Member] Customer	Dec. 31, 2012 Accounts Receivable [Member] Customer Concentration Risk [Member] Customer	Dec. 31, 2013 Sale of real property located in Bainbridge, Georgia [Member]	Dec. 31, 2011 Sale of real property located in Bainbridge, Georgia [Member]	Dec. 31, 2013 Buildings and improvements [Member] Minimum [Member]	Dec. 31, 2013 Buildings and improvements [Member] Maximum [Member]	Dec. 31, 2013 Other fixed assets [Member] Minimum [Member]	Dec. 31, 2013 Other fixed assets [Member] Maximum [Member]	Dec. 31, 2013 M-tron Industries, Inc. [Member]	Dec. 31, 2013 M-tron Industries, Ltd. [Member]	Dec. 31, 2013 Piezo Technology, Inc. [Member]	Dec. 31, 2013 Piezo Technology India Private Ltd. [Member]	Dec. 31, 2013 Lynch Systems, Inc. [Member]
Subsidiaries of the entity, by ownership percentage [Abstract]
Owned by The LGL Group, Inc. (in hundredths)															100.00%	99.90%	100.00%	99.00%	100.00%
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Useful Life											5 years	35 years	3 years	10 years
Depreciation expense	$ 913,000	$ 729,000
Significant Acquisitions and Disposals [Line Items]
Value of considerations received in sale										332,610
Principal amount of promissory note									237,612	322,610
Interest rate of promissory note (in hundredths)									3.25%	7.00%
Maturity date of promissory note									Jul. 28, 2016	Aug. 01, 2013
Standard Product Warranty Disclosure [Abstract]
Term of warranty	1 year
Research and Development Costs [Abstract]
Research and development costs	2,285,000	2,005,000
Advertising Expense [Abstract]
Advertising costs	90,000	42,000
Assumptions used in estimating fair value of stock options [Abstract]
Forfeiture rate (in hundredths)	5.00%	0.00%
Earnings Per Share [Abstract]
Options excluded from the diluted earnings per share computation (in shares)	177,861	130,000
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)			16.30%	24.90%	10.80%	9.80%	27.60%	42.40%
Revenue concentration greater than 10%	26,201,000	29,706,000			2,840,000	2,914,000
Accounts receivable							905,000	1,880,000
Number of independent contract manufacturers			2	2
Number of large customers							3	3
Foreign Currency Translation [Abstract]
Re-measurement loss	(86,000)	(88,000)
Restructuring Charges [Abstract]
Restructuring Charges	$ 648,000