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Note 1 - Significant Accounting Policies - Summary of Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Receivables	$ 5,422	$ 22,146
Billed Revenues [Member]
Receivables	1,863	6,760
Unbilled Revenues [Member]
Receivables	3,559	15,386
US Department of Health and Human Services [Member]
Receivables	3,547	16,376
US Department of Health and Human Services [Member] | Billed Revenues [Member]
Receivables	0	1,353
US Department of Health and Human Services [Member] | Unbilled Revenues [Member]
Receivables	3,547	15,023
Shionogi and Co. Ltd [Member]
Receivables	1,683	1,340
Shionogi and Co. Ltd [Member] | Billed Revenues [Member]
Receivables	1,679	1,336
Shionogi and Co. Ltd [Member] | Unbilled Revenues [Member]
Receivables	4	4
Green Cross Corporation [Member]
Receivables	150	2,932
Green Cross Corporation [Member] | Billed Revenues [Member]
Receivables	142	2,924
Green Cross Corporation [Member] | Unbilled Revenues [Member]
Receivables	8	8
Mundipharma International Holdings Limited [Member]
Receivables	42	56
Mundipharma International Holdings Limited [Member] | Billed Revenues [Member]
Receivables	42	56
Mundipharma International Holdings Limited [Member] | Unbilled Revenues [Member]
Receivables	$ 0	0
Seqirus UK Limited [Member]
Receivables		1,442
Seqirus UK Limited [Member] | Billed Revenues [Member]
Receivables		1,091
Seqirus UK Limited [Member] | Unbilled Revenues [Member]
Receivables		$ 351

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=120400017&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=120391452&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=120401414&loc=d3e604059-122996

Reference 4: 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(4))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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