Note 7 - Variable Interest Entities (Details Textual) - USD ($) $ in Thousands	1 Months Ended
	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Equity, Attributable to Noncontrolling Interest		$ 1,920	$ 0
LGL System [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		99.00%
LGL System [Member]
Equity, Attributable to Noncontrolling Interest		$ 1,920
Lynch Capital [Member] | LGL Nevada [Member]
Payments to Acquire Interest in Subsidiaries and Affiliates	$ 4
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	1.00%
Lynch Capital [Member] | LGL System [Member]
Payments to Acquire Interest in Subsidiaries and Affiliates	$ 1,000
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage	34.80%