Note 7 - Related Party Transactions - Transactions With Related Parties (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Income	$ 1,108	$ 1,179	$ 2,950	$ 3,135
Expense	(988)	(1,041)	(2,820)	(2,681)
Assets	43,284		43,284		$ 43,145
Liabilities	1,378		1,378		$ 1,905
GAMCO Investors, Inc. [Member]
Income	177	444	891	1,293
Expense	0	0	0	0
Assets		35,515		35,515		$ 34,242
Liabilities		0		0		0
Mtron Industries Inc [Member]
Income	0	0	0	0
Expense	40	(15)	48	(44)
Assets		0		0		0
Liabilities		196		196		59
Related Party [Member]
Income	177	444	891	1,293
Expense	$ 40	(15)	$ 48	(44)
Assets		35,515		35,515		34,242
Liabilities		$ 196		$ 196		$ 59

Amount of asset recognized for present right to economic benefit.

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+ Details

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Amount of liability recognized for present obligation requiring transfer or otherwise providing economic benefit to others.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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