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		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Net income	$ 794	$ 90	$ 762	$ 294
Less: Net income from attributable to non-controlling interests	22	18	47	64
Net income attributable to LGL Group common stockholders	$ 772	$ 72	$ 715	$ 230
Weighted average common shares outstanding - basic (in shares)	5,312,797	5,352,937	5,356,726	5,352,937
Warrants (in shares)	319,065	172,266	308,508	183,915
Restricted stock (in shares)	17,881	6,766	14,088	6,943
Weighted average common shares outstanding - diluted (in shares)	5,649,743	5,531,969	5,679,322	5,543,795
Basic (in dollars per share)	$ 0.15	$ 0.01	$ 0.13	$ 0.04
Diluted (in dollars per share)	$ 0.14	$ 0.01	$ 0.13	$ 0.04