Note 4 - Financial Instruments - Instruments by Significant Investment Category (Details) - Fair Value, Inputs, Level 1 [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Adjusted cost	$ 9,293	$ 16,853
Unrealized gains	0	100
Unrealized losses	0	0
Market value	9,293	16,953
Money Market Funds [Member]
Adjusted cost	1,793	3,004
Unrealized gains	0	0
Unrealized losses	0	0
Market value	1,793	3,004
US Treasury Securities Considered Cash Equivalents [Member]
Adjusted cost		9,849
Unrealized gains		100
Unrealized losses		0
Market value		9,949
Certificates of Deposit [Member]
Adjusted cost	7,500	4,000
Unrealized gains	0	0
Unrealized losses	0	0
Market value	$ 7,500	$ 4,000

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 940
-SubTopic 320
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479035/940-320-45-2

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