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Note 1 - Significant Accounting Policies and Concentration of Risk - Summary of Receivables (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Receivables | $ 8,768 | $ 6,243
Billed Revenues [Member] |  |
Receivables | 5,094 | 679
Unbilled Revenues [Member] |  |
Receivables | 3,674 | 5,564
US Department of Health and Human Services [Member] |  |
Receivables | 3,495 | 5,536
US Department of Health and Human Services [Member] | Billed Revenues [Member] |  |
Receivables |  |
US Department of Health and Human Services [Member] | Unbilled Revenues [Member] |  |
Receivables | 3,495 | 5,536
Shionogi and Co. Ltd [Member] |  |
Receivables | 3,451 | 469
Shionogi and Co. Ltd [Member] | Billed Revenues [Member] |  |
Receivables | 3,451 | 469
Shionogi and Co. Ltd [Member] | Unbilled Revenues [Member] |  |
Receivables |  |
Green Cross Corporation [Member] |  |
Receivables | 686 |
Green Cross Corporation [Member] | Billed Revenues [Member] |  |
Receivables | 686 |
Green Cross Corporation [Member] | Unbilled Revenues [Member] |  |
Receivables |  |
Seqirus UK Limited [Member] |  |
Receivables | 1,136 | 238
Seqirus UK Limited [Member] | Billed Revenues [Member] |  |
Receivables | 957 | 210
Seqirus UK Limited [Member] | Unbilled Revenues [Member] |  |
Receivables | $ 179 | $ 28

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