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Note 3 - Investments- Fair Value of the Company's Investments by Type (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost	$ 47,925	$ 9,989
Accrued Interest	120	65
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(82)	(13)
Total investments	47,964	10,041
US Government Agencies Debt Securities [Member]
Amortized Cost	42,005	4,043
Accrued Interest	98	17
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(42)	(7)
Total investments	42,062	4,053
Corporate Debt Securities [Member]
Amortized Cost	4,272	4,294
Accrued Interest	19	40
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(32)	(5)
Total investments	4,259	4,329
Certificates of Deposit [Member]
Amortized Cost	1,648	1,652
Accrued Interest	3	8
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(8)
Total investments	$ 1,643	$ 1,659

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