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Note 1 - Significant Accounting Policies - Summary of Receivables (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Receivables	$ 5,642	$ 22,146
Billed Revenues [Member]
Receivables	3,288	6,760
Unbilled Revenues [Member]
Receivables	2,354	15,386
US Department of Health and Human Services [Member]
Receivables	2,343	16,376
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	2,343	15,023
Shionogi and Co. Ltd [Member]
Receivables	1,682	1,340
Shionogi and Co. Ltd [Member] | Billed Revenues [Member]
Receivables	1,679	1,336
Shionogi and Co. Ltd [Member] | Unbilled Revenues [Member]
Receivables	3	4
Green Cross Corporation [Member]
Receivables	1,194	2,932
Green Cross Corporation [Member] | Billed Revenues [Member]
Receivables	1,186	2,924
Green Cross Corporation [Member] | Unbilled Revenues [Member]
Receivables	8	8
Mundipharma International Holdings Limited [Member]
Receivables	18	56
Mundipharma International Holdings Limited [Member] | Billed Revenues [Member]
Receivables	18	56
Mundipharma International Holdings Limited [Member] | Unbilled Revenues [Member]
Receivables
Seqirus UK Limited [Member]
Receivables	405	1,442
Seqirus UK Limited [Member] | Billed Revenues [Member]
Receivables	405	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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