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, 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
Stock issued for settlement of Warrants, net of costs	0	0	0	0	0	0	0
Repurchases of common stock	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
Stock issued for settlement of Warrants, net of costs	0	0	0	0	0	0	0
Repurchases of common stock	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 Dec. 31, 2024	53	(580)	46,385	(6,628)	39,230	2,010	41,240
Net income attributable to LGL Group or non-controlling interests	0	0	0	715	715	47	762
Stock-based compensation	0	0	44	0	44	0	44
Stock issued for settlement of Warrants, net of costs	1	0	225	0	226	0	226
Repurchases of common stock	0	(366)	0	0	(366)	0	(366)
Balance at Sep. 30, 2025	54	(946)	46,654	(5,913)	39,849	2,057	41,906
Balance at Jun. 30, 2025	53	(580)	46,309	(6,685)	39,097	2,035	41,132
Net income attributable to LGL Group or non-controlling interests	0	0	0	772	772	22	794
Stock-based compensation	0	0	18	0	18	0	18
Stock issued for settlement of Warrants, net of costs	1	0	327	0	328	0	328
Repurchases of common stock	0	(366)	0	0	(366)	0	(366)
Balance at Sep. 30, 2025	$ 54	$ (946)	$ 46,654	$ (5,913)	$ 39,849	$ 2,057	$ 41,906