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Note 1 - Significant Accounting Policies and Concentrations of Risk - Summary of Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Receivables	$ 22,146	$ 4,293
Billed Revenues [Member]
Receivables	6,760	2,714
Unbilled Revenues [Member]
Receivables	15,386	1,579
US Department of Health and Human Services [Member]
Receivables	16,376	1,525
US Department of Health and Human Services [Member] | Billed Revenues [Member]
Receivables	1,353
US Department of Health and Human Services [Member] | Unbilled Revenues [Member]
Receivables	15,023	1,525
Shionogi and Co. Ltd [Member]
Receivables	1,340	854
Shionogi and Co. Ltd [Member] | Billed Revenues [Member]
Receivables	1,336	854
Shionogi and Co. Ltd [Member] | Unbilled Revenues [Member]
Receivables	4
Green Cross Corporation [Member]
Receivables	2,932	904
Green Cross Corporation [Member] | Billed Revenues [Member]
Receivables	2,924	876
Green Cross Corporation [Member] | Unbilled Revenues [Member]
Receivables	8	28
Mundipharma International Holdings Limited [Member]
Receivables	56	44
Mundipharma International Holdings Limited [Member] | Billed Revenues [Member]
Receivables	56	44
Mundipharma International Holdings Limited [Member] | Unbilled Revenues [Member]
Receivables
Seqirus UK Limited [Member]
Receivables	1,442	966
Seqirus UK Limited [Member] | Billed Revenues [Member]
Receivables	1,091	940
Seqirus UK Limited [Member] | Unbilled Revenues [Member]
Receivables	$ 351	$ 26

X

- Definition

The total amount due to the entity within one year of the balance sheet date (or one operating cycle, if longer) from outside sources, including trade accounts receivable, notes and loans receivable, as well as any other types of receivables, net of allowances established for the purpose of reducing such receivables to an amount that approximates their net realizable value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(5))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 210
-Section S99
-Paragraph 3
-Subparagraph (SX 210.6-06(3))
-URI http://asc.fasb.org/extlink&oid=6488278&loc=d3e604059-122996

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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