Note 6 - Variable Interest Entities - VIEs (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Cash and cash equivalents		$ 86,930		$ 86,930		$ 41,514
Accounts receivable, net of allowance of $0 and $52, respectively		558		558		572
Total current assets		88,741		88,741		46,324
Other assets		68		68		0
Total assets		91,972		91,972		46,776
Total liabilities		2,245		2,245		1,211
Equity, Attributable to Noncontrolling Interest		3,795		3,795		2,077
Total revenue		1,464	$ 1,108	3,702	$ 2,950
Less: Net income attributable to non-controlling interests		45	22	63	47
Net income attributable to LGL Group		(45)	772	(1,020)	715
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents		3,232		3,232		3,169
Restricted cash and cash equivalents		20		20		0
Accounts receivable, net of allowance of $0 and $52, respectively		17		17		17
Total current assets		3,269		3,269		3,186
Convertible promissory note, at fair value		2,464		2,464		0
Other assets		56		56		0
Total assets		5,789		5,789		3,186
Total liabilities		0		0		0
Total revenue		78	33	139	94
Less: Net income attributable to non-controlling interests		45	22	63	47
Net income attributable to LGL Group		34	$ 11	44	$ 25
LGL Systems Acquisition Holding Company, LLC [Member]
Equity, Attributable to Noncontrolling Interest		2,118		2,118		2,077
Variable Interest Entity, Not Primary Beneficiary [Member]
Total assets		3,818		3,818		615
On-balance sheet	[1],[2]	2,524		2,524		4
Off-balance sheet		0		0		0
Total		2,524		2,524		4
Skyline SPV [Member]
Total assets		3,194		3,194
Equity, Attributable to Noncontrolling Interest		1,677		1,677		$ 0
Total		$ 2,520		$ 2,520

[1] As of September 30, 2026 and December 31, 2025, our investment in LGL Nevada was recorded in Other assets in the Condensed Consolidated Balance Sheets.

[2] As of September 30, 2026, the Company's exposure to Skyline was reflected through Skyline SPV, a consolidated VIE, and recorded in Convertible promissory note, at fair value and Other assets (Accrued interest receivable) on the Condensed Consolidated Balance Sheets.