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Note 8 - Marketable Securities - Short-term and Long-term Available for Sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Amortized Cost	$ 48,746
Unrealized Gains	2
Unrealized Losses	(638)
Fair Value	48,110
Amortized Cost		$ 26,039
Unrealized Gains		7
Unrealized Losses		(126)
Fair Value		25,920
Bank Time Deposits [Member]
Amortized Cost	1,438
Unrealized Gains	2
Unrealized Losses	(2)
Fair Value	1,438
Amortized Cost		1,687
Unrealized Gains		7
Unrealized Losses		0
Fair Value		1,694
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	14,889
Unrealized Gains	0
Unrealized Losses	(264)
Fair Value	14,625
Amortized Cost		12,549
Unrealized Gains		0
Unrealized Losses		(70)
Fair Value		12,479
Corporate Debt Securities [Member]
Amortized Cost	12,144
Unrealized Gains	0
Unrealized Losses	(180)
Fair Value	11,964
Amortized Cost		9,303
Unrealized Gains		0
Unrealized Losses		(44)
Fair Value		9,259
US Government Agencies Debt Securities [Member]
Amortized Cost	17,288
Unrealized Gains	0
Unrealized Losses	(188)
Fair Value	17,100
Amortized Cost		2,500
Unrealized Gains		0
Unrealized Losses		(12)
Fair Value		2,488
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost	2,987
Unrealized Gains	0
Unrealized Losses	(4)
Fair Value	$ 2,983
Amortized Cost		0
Unrealized Gains		0
Unrealized Losses		0
Fair Value		$ 0

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