Note 4 - Financial Instruments - Instruments by Significant Investment Category (Details) - Fair Value, Inputs, Level 1 [Member] - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Adjusted cost	$ 16,853	$ 31,659
Unrealized gains	100	0
Unrealized losses	0	(6)
Market value	16,953	31,653
Money Market Funds [Member]
Adjusted cost	3,004	1,670
Unrealized gains	0	0
Unrealized losses	0	0
Market value	3,004	1,670
US Treasury Securities Considered Cash Equivalents [Member]
Adjusted cost	9,849	29,989
Unrealized gains	100	0
Unrealized losses	0	(6)
Market value	9,949	$ 29,983
Certificates of Deposit [Member]
Adjusted cost	4,000
Unrealized gains	0
Unrealized losses	0
Market value	$ 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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 320
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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