Note 11 - Earnings Per Share ("EPS") - Reconciliation of Basic to Diluted Weighted Average Shares Outstanding (Details) - USD ($) $ / shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Income from continuing operations	$ 13	$ 43
Less: Net income from continuing operations attributable to non-controlling interests	19	22
Net (loss) income attributable to LGL Group common stockholders	$ (6)	$ 21
Weighted average common shares outstanding - basic (in shares)	5,352,937	5,352,937
Warrants (in shares)	0	246,422
Restricted stock (in shares)	0	5,071
Weighted average common shares outstanding - diluted (in shares)	5,352,937	5,604,430
Basic (in dollars per share)	$ (0)	$ 0
Diluted (in dollars per share)	$ (0)	$ 0