Consolidated Statements of Stockholders' Equity - 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 (in shares) at Dec. 31, 2021	5,308,973
Balance at Dec. 31, 2021	$ 53	$ (580)	$ 45,817	$ 9,453	$ 54,743	$ 0	$ 54,743
Net loss attributable to LGL Group or non-controlling interests	0	0	0	(2,992)	(2,992)	0	(2,992)
Consolidation of non-controlling interests	0	0	0	0	0	0	0
MtronPTI Spin-off	$ 0	0	0	(13,790)	(13,790)	0	(13,790)
Exercise of stock options (in shares)	15,000
Exercise of stock options	$ 0	0	191	0	191	0	191
Repurchase of shares exercised (in shares)	(4,786)
Repurchase of shares exercised	$ 0	0	(50)	0	(50)	0	(50)
Stock-based compensation (in shares)	30,000
Stock-based compensation	$ 0	0	388	0	388	0	388
Balance (in shares) at Dec. 31, 2022	5,349,187,000
Balance at Dec. 31, 2022	$ 53	(580)	46,346	(7,329)	38,490	0	38,490
Net loss attributable to LGL Group or non-controlling interests	0	0	0	269	269	48	317
Consolidation of non-controlling interests	0	0	0	0	0	1,872	1,872
MtronPTI Spin-off	0	0	0	0	0	0	0
Exercise of stock options	0	0	0	0	0	0	0
Repurchase of shares exercised	$ 0	0	0	0	0	0	0
Stock-based compensation (in shares)	23,868
Stock-based compensation	$ 0	0	3	0	3	0	3
Balance (in shares) at Dec. 31, 2023	5,373,055
Balance at Dec. 31, 2023	$ 53	$ (580)	$ 46,349	$ (7,060)	$ 38,762	$ 1,920	$ 40,682