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Note 8 - Marketable Securities - Short-term and Long-term Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Amortized Cost	$ 56,411
Unrealized Gains	2
Unrealized Losses	(966)
Fair Value	55,447
Amortized Cost		$ 26,039
Unrealized Gains		7
Unrealized Losses		(126)
Fair Value		25,920
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	17,893
Unrealized Gains	0
Unrealized Losses	(365)
Fair Value	17,528
Amortized Cost		12,549
Unrealized Gains		0
Unrealized Losses		(70)
Fair Value		12,479
Corporate Debt Securities [Member]
Amortized Cost	12,299
Unrealized Gains	0
Unrealized Losses	(234)
Fair Value	12,065
Amortized Cost		9,303
Unrealized Gains		0
Unrealized Losses		(44)
Fair Value		9,259
US Government Agencies Debt Securities [Member]
Amortized Cost	22,284
Unrealized Gains	2
Unrealized Losses	(355)
Fair Value	21,931
Amortized Cost		2,500
Unrealized Gains		0
Unrealized Losses		(12)
Fair Value		2,488
Bank Time Deposits [Member]
Amortized Cost	941
Unrealized Gains	0
Unrealized Losses	(6)
Fair Value	935
Amortized Cost		1,687
Unrealized Gains		7
Unrealized Losses		0
Fair Value		1,694
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost	2,994
Unrealized Gains	0
Unrealized Losses	(6)
Fair Value	$ 2,988
Amortized Cost		0
Unrealized Gains		0
Unrealized Losses		0
Fair Value		$ 0

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