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Note 3 - Related Party Transactions - Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Assets, related party	$ 28,382		$ 28,382		$ 24,305
Liabilities, related party	4,722		4,722		$ 4,410
GAMCO Investors [Member]
income (loss)	45	$ 0	79	$ 0
Expense, related party	0	0	0	0
Assets, related party	4,844	2,765	4,844	2,765
Liabilities, related party	0	0	0	0
LGL Group Inc. [Member]
income (loss)	12	12	24	24
Expense, related party	27	0	53	28
Assets, related party	74	0	74	0
Liabilities, related party	0	0	0	0
Related Party [Member]
income (loss)	57	12	103	24
Expense, related party	27	0	53	28
Assets, related party	4,918	2,765	4,918	2,765
Liabilities, related party	$ 0	$ 0	$ 0	$ 0

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