Note 11 - Earnings Per Share ("EPS") - Reconciliation of Basic to Diluted Weighted Average Shares Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Income from continuing operations		$ 43	$ 185
Less: Net income from continuing operations attributable to non-controlling interests		22	0
Income attributable to LGL Group common shareholders from continuing operations		21	185
Income from discontinued operations, net of tax		0	(28)
Net income attributable to LGL Group common stockholders		$ 21	$ 157
Weighted average common shares outstanding - basic (in shares)		5,352,937	5,352,937
Warrants (in shares)	[1]	246,422	0
Restricted stock (in shares)	[1]	5,071	0
Weighted average common shares outstanding - diluted (in shares)		5,604,430	5,352,937
Income from continuing operations (in dollars per share)	[2]	$ 0	$ 0.03
Income from discontinued operations (in dollars per share)	[2]	0	(0.01)
Net income attributable to LGL Group common stockholders (in dollars per share)	[2]	0	0.03
Income from continuing operations (in dollars per share)	[2]	0	0.03
Income from discontinued operations (in dollars per share)	[2]	0	(0.01)
Net income attributable to LGL Group common stockholders (in dollars per share)	[2]	$ 0	$ 0.03

[1] For the three months ended March 31, 2023, weighted average shares used for calculating earnings per share excludes warrants to purchase 1,051,664 shares of common stock.

[2] Basic and diluted earnings per share are calculated using actual, unrounded amounts. Therefore, the components of earnings per share may not sum to its corresponding total.