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Note 7 - Marketable Securities - Short-term and Long-term Marketable Securities (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Amortized Cost	$ 82,255,000	$ 94,458,000
Unrealized Gains
Unrealized Losses	(431,000)	(463,000)
Fair Value	81,824,000	93,995,000
Bank Time Deposits [Member]
Amortized Cost	3,968,000	3,968,000
Unrealized Gains
Unrealized Losses	(38,000)	(32,000)
Fair Value	3,930,000	3,936,000
Commercial Paper [Member]
Amortized Cost	1,254,000
Unrealized Gains
Unrealized Losses	0
Fair Value	1,254,000
US States and Political Subdivisions Debt Securities [Member]
Amortized Cost	18,013,000	28,364,000
Unrealized Gains
Unrealized Losses	(58,000)	(104,000)
Fair Value	17,955,000	28,260,000
Corporate Debt Securities [Member]
Amortized Cost	34,346,000	29,806,000
Unrealized Gains
Unrealized Losses	(157,000)	(128,000)
Fair Value	34,189,000	29,678,000
US Government Agencies Debt Securities [Member]
Amortized Cost	24,674,000	32,320,000
Unrealized Gains
Unrealized Losses	(178,000)	(199,000)
Fair Value	$ 24,496,000	$ 32,121,000

X

- Definition

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

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