Note 3 - Financial Instruments - Instruments by Significant Investment Category (Details) - Fair Value, Inputs, Level 1 [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2023	Dec. 31, 2022
Adjusted Cost	$ 9,274	$ 16,853
Unrealized Gains	0	100
Unrealized Losses	0	0
Market Value	9,274	16,953
Money Market Funds [Member]
Adjusted Cost	2,774	3,004
Unrealized Gains	0	0
Unrealized Losses	0	0
Market Value	2,774	3,004
US Treasury Securities in Short-term Investments [Member]
Adjusted Cost		9,849
Unrealized Gains		100
Unrealized Losses		0
Market Value		9,949
Certificates of Deposit [Member]
Adjusted Cost	6,500	4,000
Unrealized Gains	0	0
Unrealized Losses	0	0
Market Value	6,500	$ 4,000
US Treasury Securities Considered Cash Equivalents [Member]
Adjusted Cost	0
Unrealized Gains	0
Unrealized Losses	0
Market Value	$ 0

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://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481961/940-320-45-2

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