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Note 3 - Collaborative and Other Research and Development Contracts 1 (Details Textual) - USD ($) $ in Thousands							1 Months Ended				3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended	64 Months Ended	66 Months Ended
	Sep. 03, 2020	Mar. 04, 2020	Nov. 05, 2019	Sep. 06, 2018	Jun. 16, 2015	Feb. 28, 2006	Aug. 31, 2020	Sep. 30, 2013	Jun. 30, 2006	Jun. 30, 2000	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019	Sep. 30, 2020	Sep. 30, 2020	Mar. 31, 2015	Nov. 11, 2011
Revenue from Contract with Customer, Including Assessed Tax											$ 6,102	$ 1,775		$ 13,796	$ 9,110
Arbitration Proceedings of SUL Agreement [Member]
Litigation Settlement, Amount Awarded from Other Party		$ 5,000
Arbitration Proceedings of SUL Agreement [Member] | Other Income [Member]
Gain (Loss) Related to Litigation Settlement, Total														8,893
Arbitration Proceedings of SUL Agreement [Member] | Selling, General and Administrative Expenses [Member]
Legal Fees													$ 5,026
US Department of Health and Human Services [Member]
Collaborative Agreement Contract Value				$ 34,660
Contract Term (Year)				5 years
Proceeds from Collaborators	$ 6,932															$ 13,864
Torii Pharmaceutical Co. [Member]
Upfront Payments Receivable Amount			$ 22,000
Potential Milestone Payments Receivable if Regulatory Approval Before December 31, 2020			20,000
Potential Milestone Payments Receivable if Regulatory Approval Before December 31, 2021			$ 15,000
Maximum Customary Reduction on Royalty Rate			50.00%
Royalty Payments Receivable, Expiration Term From First Commercial (Year)			10 years
Revenue from Contract with Customer, Including Assessed Tax																20,101
Torii Pharmaceutical Co. [Member] | License [Member]
Revenue from Contract with Customer, Including Assessed Tax																19,344
Torii Pharmaceutical Co. [Member] | Service [Member]
Revenue from Contract with Customer, Including Assessed Tax																$ 757
Torii Pharmaceutical Co. [Member] | Minimum [Member]
Royalty Rate if Maintains Sakigake Designation			20.00%
Royalty Rate, Otherwise			15.00%
Torii Pharmaceutical Co. [Member] | Maximum [Member]
Royalty Rate if Maintains Sakigake Designation			40.00%
Royalty Rate, Otherwise			35.00%
CSL Limited [Member
Proceeds from License Fees Received					$ 33,740
Milestone Payment Received																	$ 12,000
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 (Day)										60 days
National Institute of Allergy and Infectious Diseases [Member]
Collaborative Agreement Contract Value							$ 6,326	$ 5,000
Expected Receivable From Awards for Research and Development Contracts														$ 45,931
Collaborative Agreement Contract, Covenant, Maximum Amount of Funding							$ 43,908
UAB [Member]
Period of Agreement (Year)														25 years
Renewable Period of Agreement (Year)														5 years

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