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Note 1 - Basis of Presentation (Details Textual) | Oct. 07, 2022 shares
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Mtron Industries Inc [Member] |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 0.00%
Spinoff [Member] | Mtron Industries Inc [Member] |
Percentage of Shares Distribution Under Spinoff | 100.00%
Right to Receive Common Stock Share for Each Share (in shares) | 0.5

X
- Definition Percentage of shares distribution under spinoff. + References No definition available. + Details
Name: | lgl_PercentageOfSharesDistributionUnderSpinoff
Namespace Prefix: | lgl_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Right to receive common stock share for each share. + References No definition available. + Details
Name: | lgl_RightToReceiveCommonStockShareForEachShare
Namespace Prefix: | lgl_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
Name: | us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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

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: |