Note 3 - Fair Value Measurements - Instruments by Significant Investment Category (Details) - Fair Value, Inputs, Level 1 [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 30, 2021	Dec. 31, 2020
Adjusted Cost	$ 31,528	$ 41,012
Unrealized Gains	11	15
Unrealized Losses	0	0
Market Value	31,539	41,027
Money Market Fund [Member]
Adjusted Cost	1,535	6,035
Unrealized Gains	0	0
Unrealized Losses	0	0
Market Value	1,535	6,035
US Treasury Securities Considered Cash Equivalents [Member]
Adjusted Cost	0	9,998
Unrealized Gains	0	0
Unrealized Losses	0	0
Market Value	0	9,998
US Treasury Securities in Short-term Investments [Member]
Adjusted Cost	29,993	24,979
Unrealized Gains	11	15
Unrealized Losses	0	0
Market Value	$ 30,004	$ 24,994

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 http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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