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Note 3 - Accounting Policies - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Available-for-sale, amortized cost	$ 83,987	$ 37,741
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses	(6)	(17)
Available-for-sale, current	83,981	37,724
US Government Agencies Debt Securities [Member]
Available-for-sale, amortized cost	19,983
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses	(2)
Available-for-sale, current	19,981
Domestic Corporate Debt Securities [Member]
Available-for-sale, amortized cost	12,593	12,048
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses	(3)	(9)
Available-for-sale, current	12,590	12,039
Foreign Corporate Debt Securities [Member]
Available-for-sale, amortized cost		14,065
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses		(8)
Available-for-sale, current		14,057
United States Commercial Paper [Member]
Available-for-sale, amortized cost	25,451	8,635
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses	(1)
Available-for-sale, current	25,450	8,635
Foreign Commercial Paper [Member]
Available-for-sale, amortized cost	25,960	2,993
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses
Available-for-sale, current	$ 25,960	$ 2,993

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562

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X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity 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
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity 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
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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