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Note 7 - Marketable Securities - Short-term and Long-term Available for Sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Amortized Cost	$ 46,924
Unrealized Gains	165
Unrealized Losses	(48)
Fair Value	47,041
Amortized Cost		$ 93,445
Unrealized Gains		393
Unrealized Losses		(23)
Fair Value		93,815
Bank Time Deposits [Member]
Amortized Cost	5,394
Unrealized Gains	54
Unrealized Losses	0
Fair Value	5,448
Amortized Cost		5,395
Unrealized Gains		93
Unrealized Losses		0
Fair Value		5,488
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	20,968
Unrealized Gains	43
Unrealized Losses	(17)
Fair Value	20,994
Amortized Cost		25,003
Unrealized Gains		83
Unrealized Losses		(2)
Fair Value		25,084
Corporate Debt Securities [Member]
Amortized Cost	19,062
Unrealized Gains	68
Unrealized Losses	(29)
Fair Value	19,101
Amortized Cost		42,048
Unrealized Gains		211
Unrealized Losses		(11)
Fair Value		42,248
US Government Agencies Debt Securities [Member]
Amortized Cost	1,500
Unrealized Gains	0
Unrealized Losses	(2)
Fair Value	$ 1,498
Amortized Cost		18,500
Unrealized Gains		6
Unrealized Losses		(10)
Fair Value		18,496
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost		2,499
Unrealized Gains		0
Unrealized Losses		0
Fair Value		$ 2,499

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