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		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Income (loss) from continuing operations		$ 161	$ (130)	$ 204	$ 55
Less: Net income from continuing operations attributable to non-controlling interests		24	0	46	0
Income (loss) attributable to LGL Group common shareholders from continuing operations		137	(130)	158	55
Income (loss) from discontinued operations, net of tax		0	0	0	(28)
Net income (loss) attributable to LGL Group common stockholders		$ 137	$ (130)	$ 158	$ 27
Weighted average common shares outstanding - basic (in shares)		5,352,937	5,352,937	5,352,937	5,352,937
Warrants (in shares)	[1]	125,178	0	190,399	0
Restricted stock (in shares)	[1]	4,428	0	5,533	0
Weighted average common shares outstanding - diluted (in shares)	[1]	5,482,543	5,352,937	5,548,869	5,352,937
Income (loss) from continuing operations (in dollars per share)	[2]	$ 0.03	$ (0.02)	$ 0.03	$ 0.01
Income (loss) from discontinued operations (in dollars per share)	[2]	0	0	0	(0.01)
Net income (loss) attributable to LGL Group common stockholders (in dollars per share)	[2]	0.03	(0.02)	0.03	0.01
Income (loss) from continuing operations (in dollars per share)	[2]	0.02	(0.02)	0.03	0.01
Income (loss) from discontinued operations (in dollars per share)	[2]	0	0	0	(0.01)
Net income (loss) attributable to LGL Group common stockholders (in dollars per share)	[2]	$ 0.02	$ (0.02)	$ 0.03	$ 0.01

[1] For the three and six months ended June 30, 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.