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Note 3 - Collaborative and Other Research and Development Contracts (Details Textual) - USD ($)		1 Months Ended				6 Months Ended	34 Months Ended
	Jun. 16, 2015	Sep. 30, 2013	Jun. 30, 2006	Feb. 28, 2006	Jun. 30, 2000	Jun. 30, 2016	Jun. 30, 2016	Mar. 31, 2015
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
AECOM and IRL [Member]
Milestone Payment Maximum					$ 4,000,000
Milestone Payment Minimum					1,400,000
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]
Proceeds from awards for Research and Development Contracts		$ 5,000,000				5,475,000
Expected Receivable From Awards for Research and Development Contracts							$ 39,477,000
Collaboration Agreement Additional Payments Received						$ 35,350	$ 35,350
UAB [Member]
Period of Agreement						25 years
Renewable Period of Agreement						5 years
CSL Limited [Member
Proceeds from License Fees Received	$ 33,740,000
Milestone Payment Maximum	$ 12,000,000
Royalty Term	10 years

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 912
-SubTopic 310
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68054760&loc=d3e55295-109406

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585

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