Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Common Stock [Member]	Treasury Stock, Common [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2022	$ 53	$ (580)	$ 46,346	$ (7,329)	$ 38,490	$ 0	$ 38,490
Net income attributable to LGL Group or non-controlling interests	0	0	0	135	135	22	157
Stock-based compensation	0	0	0	0	0	0	0
Consolidation of non-controlling interests	0	0	0	0	0	1,872	1,872
Balance at Sep. 30, 2023	53	(580)	46,346	(7,194)	38,625	1,894	40,519
Balance at Jun. 30, 2023	53	(580)	46,346	(7,302)	38,517	1,872	40,389
Net income attributable to LGL Group or non-controlling interests	0	0	0	108	108	22	130
Stock-based compensation	0	0	0	0	0	0	0
Consolidation of non-controlling interests	0	0	0	0	0	0	0
Balance at Sep. 30, 2023	53	(580)	46,346	(7,194)	38,625	1,894	40,519
Balance at Dec. 31, 2023	53	(580)	46,349	(7,060)	38,762	1,920	40,682
Net income attributable to LGL Group or non-controlling interests	0	0	0	230	230	64	294
Stock-based compensation	0	0	27	0	27	0	27
Consolidation of non-controlling interests	0	0	0	0	0	0	0
Balance at Sep. 30, 2024	53	(580)	46,376	(6,830)	39,019	1,984	41,003
Balance at Jun. 30, 2024	53	(580)	46,367	(6,902)	38,938	1,966	40,904
Net income attributable to LGL Group or non-controlling interests	0	0	0	72	72	18	90
Stock-based compensation	0	0	9	0	9	0	9
Consolidation of non-controlling interests	0	0	0	0	0	0	0
Balance at Sep. 30, 2024	$ 53	$ (580)	$ 46,376	$ (6,830)	$ 39,019	$ 1,984	$ 41,003