Note 3 - Fair Value Measurements - Instruments by Significant Investment Category (Details) - Fair Value, Inputs, Level 1 [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2022	Dec. 31, 2021
Adjusted Cost	$ 28,262	$ 31,659
Unrealized Gains	0	0
Unrealized Losses	(29)	(6)
Market Value	28,233	31,653
Money Market Fund [Member]
Adjusted Cost	3,277	1,670
Unrealized Gains	0	0
Unrealized Losses	0	0
Market Value	3,277	1,670
US Treasury Securities in Short-term Investments [Member]
Adjusted Cost	24,985	29,989
Unrealized Gains	0	0
Unrealized Losses	(29)	(6)
Market Value	$ 24,956	$ 29,983

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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