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Note 3 - Collaborative and Other Research and Development Contracts (Details Textual) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 46 Months Ended | 48 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 16, 2015 | Feb. 28, 2006 | Sep. 30, 2013 | Jun. 30, 2006 | Jun. 30, 2000 | Mar. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2015 | Nov. 11, 2011
CSL Limited [Member |  |  |  |  |  |  |  |  |  |
Proceeds from License Fees Received | $ 33,740 |  |  |  |  |  |  |  |  |
Milestone Payment Received |  |  |  |  |  |  | $ 12,000 |  |  |
Royalty Term | 10 years |  |  |  |  |  |  |  |  |
Base Contract [Member] |  |  |  |  |  |  |  |  |  |
Government Contract Receivable |  |  |  |  |  |  |  |  | $ 16,265 |
Additional Development Options [Member] |  |  |  |  |  |  |  |  |  |
Government Contract Receivable |  |  |  |  |  |  |  |  | 22,855 |
ASPRBARDA Contract [Member] |  |  |  |  |  |  |  |  |  |
Government Contract Receivable |  |  |  |  |  |  |  |  | $ 39,120 |
Proceeds from awards for Research and Development Contracts |  |  |  |  |  |  |  | $ 20,574 |  |
Green Cross Corporation [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from License Fees Received |  |  |  | $ 250 |  |  |  |  |  |
Mundipharma [Member] |  |  |  |  |  |  |  |  |  |
Upfront Payments Receivable Amount |  | $ 10,000 |  |  |  |  |  |  |  |
Potential Milestone Payments Receivable |  |  |  |  |  |  |  |  |  | $ 15,000
AECOM and IRL [Member] |  |  |  |  |  |  |  |  |  |
Milestone Payment Minimum |  |  |  |  | $ 1,400 |  |  |  |  |
Milestone Payment Maximum |  |  |  |  | 4,000 |  |  |  |  |
Annual License Fee Minimum |  |  |  |  | 150 |  |  |  |  |
Annual License Fee Maximum |  |  |  |  | $ 500 |  |  |  |  |
Advance Notice Period for Termination of Agreement |  |  |  |  | 60 days |  |  |  |  |
National Institute of Allergy and Infectious Diseases [Member] |  |  |  |  |  |  |  |  |  |
Collaborative Agreement Contract Value |  |  | $ 5,000 |  |  |  |  |  |  |
Expected Receivable From Awards for Research and Development Contracts |  |  |  |  |  | $ 43,035 |  |  |  |
UAB [Member] |  |  |  |  |  |  |  |  |  |
Period of Agreement |  |  |  |  |  | 25 years |  |  |  |
Renewable Period of Agreement |  |  |  |  |  | 5 years |  |  |  |

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