Note 4 - Marketable Securities and Time Deposits (Details) - Marketable Debt Securities by Contractual Maturities - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Note 4 - Marketable Securities and Time Deposits (Details) - Marketable Debt Securities by Contractual Maturities [Line Items]
Marketable debt securities, amortized cost	$ 104,992	$ 108,285
Marketable debt securities, estimated fair value	104,930	$ 107,784
Debt Securities [Member]
Note 4 - Marketable Securities and Time Deposits (Details) - Marketable Debt Securities by Contractual Maturities [Line Items]
Marketable debt securities, amortized cost	104,992
Marketable debt securities, unrealized gains	206
Marketable debt securities, unrealized losses	(268)
Marketable debt securities, estimated fair value	104,930
Debt Securities [Member] \| Due in One Year or Less [Member]
Note 4 - Marketable Securities and Time Deposits (Details) - Marketable Debt Securities by Contractual Maturities [Line Items]
Marketable debt securities, amortized cost	19,015
Marketable debt securities, unrealized gains	16
Marketable debt securities, unrealized losses	(3)
Marketable debt securities, estimated fair value	19,028
Debt Securities [Member] \| Due After One Year to Five Years [Member]
Note 4 - Marketable Securities and Time Deposits (Details) - Marketable Debt Securities by Contractual Maturities [Line Items]
Marketable debt securities, amortized cost	85,977
Marketable debt securities, unrealized gains	190
Marketable debt securities, unrealized losses	(265)
Marketable debt securities, estimated fair value	$ 85,902

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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-Publisher FASB
-Name Accounting Standards Codification
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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-Subparagraph (SX 210.5-02.2)
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