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Note 3 - Collaborative and Other Research and Development Contracts (Details Textual) - USD ($) |  |  |  | 1 Months Ended | 6 Months Ended | 49 Months Ended | 51 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 06, 2018 | Jun. 16, 2015 | Feb. 28, 2006 | Sep. 30, 2013 | Jun. 30, 2006 | Jun. 30, 2000 | Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2015 | Nov. 11, 2011
Centers for Disease Control and Prevention [Member] |  |  |  |  |  |  |  |  |  |  |
Collaborative Agreement Contract Value | $ 34,660 |  |  |  |  |  |  |  |  |  |
Contract Term | 5 years |  |  |  |  |  |  |  |  |  |
CSL Limited [Member |  |  |  |  |  |  |  |  |  |  |
Proceeds from License Fees Received |  | $ 33,740,000 |  |  |  |  |  |  |  |  |
Milestone Payment Received |  |  |  |  |  |  |  | $ 12,000,000 |  |  |
Royalty Term |  | 10 years |  |  |  |  |  |  |  |  |
Base Contract [Member] |  |  |  |  |  |  |  |  |  |  |
Government Contract Receivable |  |  |  |  |  |  |  |  |  | $ 16,265,000 |
Additional Development Options [Member] |  |  |  |  |  |  |  |  |  |  |
Government Contract Receivable |  |  |  |  |  |  |  |  |  | 22,855,000 |
ASPRBARDA Contract [Member] |  |  |  |  |  |  |  |  |  |  |
Government Contract Receivable |  |  |  |  |  |  |  |  |  | $ 39,120,000 |
Proceeds from awards for Research and Development Contracts |  |  |  |  |  |  |  |  | $ 20,574,000 |  |
Green Cross Corporation [Member] |  |  |  |  |  |  |  |  |  |  |
Proceeds from License Fees Received |  |  |  |  | $ 250,000 |  |  |  |  |  |
Mundipharma [Member] |  |  |  |  |  |  |  |  |  |  |
Upfront Payments Receivable Amount |  |  | $ 10,000,000 |  |  |  |  |  |  |  |
Potential Milestone Payments Receivable |  |  |  |  |  |  |  |  |  |  | $ 15,000,000
AECOM and IRL [Member] |  |  |  |  |  |  |  |  |  |  |
Milestone Payment Minimum |  |  |  |  |  | $ 1,400,000 |  |  |  |  |
Milestone Payment Maximum |  |  |  |  |  | 4,000,000 |  |  |  |  |
Annual License Fee Minimum |  |  |  |  |  | 150,000 |  |  |  |  |
Annual License Fee Maximum |  |  |  |  |  | $ 500,000 |  |  |  |  |
Advance Notice Period for Termination of Agreement |  |  |  |  |  | 60 days |  |  |  |  |
National Institute of Allergy and Infectious Diseases [Member] |  |  |  |  |  |  |  |  |  |  |
Collaborative Agreement Contract Value |  |  |  | $ 5,000,000 |  |  |  |  |  |  |
Expected Receivable From Awards for Research and Development Contracts |  |  |  |  |  |  | $ 43,035,000 |  |  |  |
UAB [Member] |  |  |  |  |  |  |  |  |  |  |
Period of Agreement |  |  |  |  |  |  | 25 years |  |  |  |
Renewable Period of Agreement |  |  |  |  |  |  | 5 years |  |  |  |

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