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Note 6 - Marketable Securities - Short-term and Long-term Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Amortized Cost	$ 53,307	$ 70,329
Unrealized Gains	69	1
Unrealized Losses	(83)	(242)
Fair Value	53,293	70,088
Bank Time Deposits [Member]
Amortized Cost	3,464	4,208
Unrealized Gains	10
Unrealized Losses	(10)	(25)
Fair Value	3,464	4,183
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	10,825	17,509
Unrealized Gains	7	1
Unrealized Losses	(6)	(33)
Fair Value	10,826	17,477
Corporate Debt Securities [Member]
Amortized Cost	24,513	31,769
Unrealized Gains	52
Unrealized Losses	(27)	(96)
Fair Value	24,538	31,673
US Government Agencies Debt Securities [Member]
Amortized Cost	14,505	16,843
Unrealized Gains
Unrealized Losses	(40)	(88)
Fair Value	$ 14,465	$ 16,755

X

- Definition

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

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

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