Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net loss attributable to LGL Group or non-controlling interests	$ 317	$ (2,992)
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation	1	496
Amortization of finite-lived intangible assets	21	62
Stock-based compensation	3	388
Realized loss on sale of marketable securities	4,316	22,868
Unrealized gain on marketable securities	(4,700)	(18,121)
Deferred income tax expense (benefit)	82	(1,516)
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable, net	187	(613)
Decrease (increase) in inventories, net	61	(2,330)
Decrease (increase) in prepaid expenses and other assets	167	(135)
Decrease in income taxes payable	40	(476)
(Decrease) increase in accounts payable, accrued compensation and commissions expense and other	(110)	1,552
Total adjustments	68	2,175
Net cash provided by (used in) operating activities	385	(817)
Cash flows from investing activities:
Capital expenditures	0	(662)
Proceeds from sale of marketable securities	16,947	2,058
Purchase of marketable securities	0	(7,229)
Consolidation of noncontrolling interests	1,872	0
Net cash provided by (used in) investing activities	18,819	(5,833)
Cash flows from financing activities:
Transfer to M-tron Industries, Inc. related to Separation	0	(1,000)
Exercise of stock options	0	191
Payment for taxes related to net share settlement of equity awards	0	(50)
Net cash (used in) financing activities	0	(859)
Increase (decrease) in cash and cash equivalents	19,204	(7,509)
Cash and cash equivalents at beginning of year	21,507	29,016
Cash and cash equivalents at end of year	40,711	21,507
Noncash Financing Activity:
Distribution of M-tron Industries, Inc. related to Separation	0	(12,790)
Supplemental Disclosure:
Income taxes paid	$ 207	$ 741