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Accounting And Reporting Policies (Details) (USD $) | 12 Months Ended |
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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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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