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Note 1 - Significant Accounting Policies - Summary of Receivables (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Receivables | $ 5,002 | $ 4,293
Billed Revenues [Member] |  |
Receivables | 3,962 | 2,714
Unbilled Revenues [Member] |  |
Receivables | 1,040 | 1,579
US Department of Health and Human Services [Member] |  |
Receivables | 1,687 | 1,525
US Department of Health and Human Services [Member] | Billed Revenues [Member] |  |
Receivables | 673 |
US Department of Health and Human Services [Member] | Unbilled Revenues [Member] |  |
Receivables | 1,014 | 1,525
Shionogi and Co. Ltd [Member] |  |
Receivables | 1,451 | 854
Shionogi and Co. Ltd [Member] | Billed Revenues [Member] |  |
Receivables | 1,451 | 854
Shionogi and Co. Ltd [Member] | Unbilled Revenues [Member] |  |
Receivables |  |
Green Cross Corporation [Member] |  |
Receivables | 642 | 904
Green Cross Corporation [Member] | Billed Revenues [Member] |  |
Receivables | 642 | 876
Green Cross Corporation [Member] | Unbilled Revenues [Member] |  |
Receivables |  | 28
Mundipharma International Holdings Limited [Member] |  |
Receivables | 21 | 44
Mundipharma International Holdings Limited [Member] | Billed Revenues [Member] |  |
Receivables | 21 | 44
Mundipharma International Holdings Limited [Member] | Unbilled Revenues [Member] |  |
Receivables |  |
Seqirus UK Limited [Member] |  |
Receivables | 1,201 | 966
Seqirus UK Limited [Member] | Billed Revenues [Member] |  |
Receivables | 1,175 | 940
Seqirus UK Limited [Member] | Unbilled Revenues [Member] |  |
Receivables | $ 26 | $ 26

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- 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 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(4)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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