Represents the number of customers.

No definition available.

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Balance Type:	na
Period Type:	instant

- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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Balance Type:	na
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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_ConcentrationRiskByBenchmarkAxis=us-gaap_RevenueFromContractWithCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ConcentrationRiskByTypeAxis=us-gaap_CustomerConcentrationRiskMember
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Balance Type:
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- Details

Name:	srt_MajorCustomersAxis=lgl_LargestCustomerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_MajorCustomersAxis=lgl_SecondLargestCustomerMember
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- Details

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- Details

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- Details

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Note 2 - Summary of Significant Accounting Policies (Details Textual) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2024 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Revenue from Contract with Customer, Excluding Assessed Tax	$ 653	$ 650	$ 531	$ 392	$ 446	$ 438	$ 403	$ 441	$ 2,226	$ 1,728
Revenue from Contract with Customer Benchmark [Member] \| Customer Concentration Risk [Member]
Number of Customers	2				2				2	2
Revenue from Contract with Customer Benchmark [Member] \| Customer Concentration Risk [Member] \| Largest Customer [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 310	$ 399
Concentration Risk, Percentage									13.90%	23.10%
Revenue from Contract with Customer Benchmark [Member] \| Customer Concentration Risk [Member] \| Second Largest Customer [Member]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 261	$ 236
Concentration Risk, Percentage									11.70%	13.70%
Accounts Receivable [Member] \| Customer Concentration Risk [Member]
Number of Customers	2				2				2	2
Accounts Receivable [Member] \| Customer Concentration Risk [Member] \| Two largest Customers [Member]
Concentration Risk, Percentage									42.00%	28.40%
Accounts Receivable, after Allowance for Credit Loss	$ 229				$ 118				$ 229	$ 118
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life (Year)	10 years								10 years
Other Capitalized Property Plant and Equipment [Member] \| Minimum [Member]
Property, Plant and Equipment, Useful Life (Year)	3 years								3 years
Other Capitalized Property Plant and Equipment [Member] \| Maximum [Member]
Property, Plant and Equipment, Useful Life (Year)	10 years								10 years