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Note 3 - Accounting Policies - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Available-for-sale, amortized cost	$ 122,154	$ 37,741
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses	(30)	(17)
Available-for-sale, current	122,124	37,724
US Government Agencies Debt Securities [Member]
Available-for-sale, amortized cost	24,971
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses
Available-for-sale, current	24,971
Domestic Corporate Debt Securities [Member]
Available-for-sale, amortized cost	35,052	12,048
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses	(29)	(9)
Available-for-sale, current	35,023	12,039
Foreign Corporate Debt Securities [Member]
Available-for-sale, amortized cost	8,301	14,065
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses	(1)	(8)
Available-for-sale, current	8,300	14,057
United States Commercial Paper [Member]
Available-for-sale, amortized cost	36,897	8,635
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses
Available-for-sale, current	36,897	8,635
Foreign Commercial Paper [Member]
Available-for-sale, amortized cost	16,933	2,993
Available-for-sale, gross unrealized gains
Available-for-sale, gross unrealized losses
Available-for-sale, current	$ 16,933	$ 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)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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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X

- 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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X

- 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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