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Note 3 - Collaborative and Other Research and Development Contracts (Details Textual) - USD ($) $ in Thousands		1 Months Ended			9 Months Ended	37 Months Ended
	Jun. 16, 2015	Sep. 30, 2013	Feb. 28, 2006	Jun. 30, 2000	Sep. 30, 2016	Sep. 30, 2016	Mar. 31, 2015
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
Mundipharma [Member]
Upfront Payments Receivable Amount			$ 10,000
AECOM and IRL [Member]
Milestone Payment Maximum				$ 4,000
Milestone Payment Minimum				1,400
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]
Proceeds from awards for Research and Development Contracts		$ 5,000
Expected Receivable From Awards for Research and Development Contracts						$ 39,477
UAB [Member]
Period of Agreement					25 years
Renewable Period of Agreement					5 years
CSL Limited [Member
Proceeds from License Fees Received	$ 33,740
Milestone Payment Maximum	$ 12,000
Royalty Term	10 years

X

- Definition

Represents advance notice period for termination of agreement.

+ References

No definition available.

+ Details

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- Definition

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+ References

No definition available.

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X

- Definition

Represent minimum annual license fee.

+ References

No definition available.

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X

- Definition

Represents expected receivable from awards for research and development contracts.

+ References

No definition available.

+ Details

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- Definition

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No definition available.

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- Definition

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- Definition

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+ References

No definition available.

+ Details

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X

- Definition

Represents proceeds from awards for research and development contracts.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

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+ References

No definition available.

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- Definition

Period of time between the date of the Agreement and its expiration.

+ References

No definition available.

+ Details

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X

- Definition

Represents upfront payments receivable.

+ References

No definition available.

+ Details

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X

- Definition

The amount of receivables that are derived from government contracts.

+ References

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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- Definition

Cash received from licensees for license fees during the current period.

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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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