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Note 1 - Significant Accounting Policies - Summary of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
US Department of Health and Human Services [Member]
Collaborative and other research and development revenues	$ 3,813	$ 4,582	$ 9,846	$ 12,788
Green Cross Corporation [Member]
Collaborative and other research and development revenues		132		132
Shionogi and Co. Ltd [Member]
Collaborative and other research and development revenues	296	296	888	888
Seqirus UK Limited [Member]
Collaborative and other research and development revenues	153	152	616	21,835
Product sales, net		5,699		6,236
Royalty revenue	3,501	126	6,020	1,776
Collaborative and other research and development revenues	4,262	5,162	11,350	35,643
Revenues	$ 7,763	$ 10,987	$ 17,370	$ 43,655

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- Definition

Represents collaborative and other research and development.

+ References

No definition available.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(a))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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