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Note 3 - Discontinued Operations (Details Textual) - Spinoff [Member] - Mtron Industries Inc [Member] - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 07, 2022 | Dec. 31, 2023 | Dec. 31, 2022
Write Off of Intercompany Receivables | $ 4,439 |  |
Spin Off Costs |  | $ 56 | $ 638
Excess Separation Costs |  | $ 28 | 219
Separation Costs, Net. |  |  | $ 419

X
- Definition The amount of excess separation costs. + References No definition available. + Details
Name: | lgl_ExcessSeparationCosts
Namespace Prefix: | lgl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of separation costs net of shares costs. + References No definition available. + Details
Name: | lgl_SeparationCostsNet
Namespace Prefix: | lgl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Spin-off costs. + References No definition available. + Details
Name: | lgl_SpinOffCosts
Namespace Prefix: | lgl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Write off of intercompany receivables. + References No definition available. + Details
Name: | lgl_WriteOffOfIntercompanyReceivables
Namespace Prefix: | lgl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=us-gaap_SpinoffMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=lgl_MtronIndustriesIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |