XML 75 R53.htm IDEA: XBRL DOCUMENT
v3.24.1

Note 6 - Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Assets, Fair Value Disclosure |  | $ 40,251 | $ 34,307
Cash and Cash Equivalents [Member] |  |  |
Assets, Fair Value Disclosure | [1] | 40,229 | 17,722
Equity Securities [Member] |  |  |
Assets, Fair Value Disclosure |  | 22 | 69
Mutual Fund [Member] |  |  |
Assets, Fair Value Disclosure |  | 0 | 16,516
Marketable Securities [Member] |  |  |
Assets, Fair Value Disclosure |  | 22 | 16,585
Fair Value, Inputs, Level 1 [Member] |  |  |
Assets, Fair Value Disclosure |  | 40,251 | 17,791
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |
Assets, Fair Value Disclosure | [1] | 40,229 | 17,722
Fair Value, Inputs, Level 1 [Member] | Equity Securities [Member] |  |  |
Assets, Fair Value Disclosure |  | 22 | 69
Fair Value, Inputs, Level 1 [Member] | Mutual Fund [Member] |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Marketable Securities [Member] |  |  |
Assets, Fair Value Disclosure |  | 22 | 69
Fair Value, Inputs, Level 2 [Member] |  |  |
Assets, Fair Value Disclosure |  | 0 | 16,516
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |  |
Assets, Fair Value Disclosure | [1] | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Equity Securities [Member] |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Mutual Fund [Member] |  |  |
Assets, Fair Value Disclosure |  | 0 | 16,516
Fair Value, Inputs, Level 2 [Member] | Marketable Securities [Member] |  |  |
Assets, Fair Value Disclosure |  | 0 | 16,516
Fair Value, Inputs, Level 3 [Member] |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] |  |  |
Assets, Fair Value Disclosure | [1] | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member] |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Mutual Fund [Member] |  |  |
Assets, Fair Value Disclosure |  | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Marketable Securities [Member] |  |  |
Assets, Fair Value Disclosure |  | $ 0 | $ 0
[1] | As of December 31, 2023 and 2022, included investments in money market mutual funds managed by GAMCO Investors, Inc.

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CashAndCashEquivalentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MutualFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=lgl_MarketableSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |