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Note 6 - Marketable Securities - Short-term and Long-term Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost	$ 77,255	$ 48,397
Unrealized Gains	574	112
Unrealized Losses	(7)	(22)
Fair Value	77,822	48,487
Bank Time Deposits [Member]
Amortized Cost	5,189	1,484
Unrealized Gains	112	22
Unrealized Losses	0	0
Fair Value	5,301	1,506
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	8,840	10,204
Unrealized Gains	71	9
Unrealized Losses	0	(3)
Fair Value	8,911	10,210
Corporate Debt Securities [Member]
Amortized Cost	34,968	26,944
Unrealized Gains	355	80
Unrealized Losses	(2)	(12)
Fair Value	35,321	27,012
US Government Agencies Debt Securities [Member]
Amortized Cost	25,272	6,274
Unrealized Gains	23	1
Unrealized Losses	(5)	(7)
Fair Value	25,290	6,268
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Amortized Cost	2,986	3,491
Unrealized Gains	13	0
Unrealized Losses	0	0
Fair Value	$ 2,999	$ 3,491

X

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

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