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Note 3 - Collaborative and Other Research and Development Contracts (Details Textual) - Scenario, Unspecified [Domain] - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 50 Months Ended
May. 31, 2015
Sep. 30, 2013
Feb. 24, 2011
May. 31, 2010
Sep. 30, 2009
Jan. 31, 2007
Jun. 30, 2006
Jun. 30, 2015
Jun. 30, 2015
Feb. 24, 2011
Mar. 31, 2015
US Department of Health and Human Services [Member]                      
Contract Term           4 years          
Collaborative Agreement Contract Value           $ 102,661          
Collaborative Agreement Additional Contract Value     $ 55,000   $ 77,191            
Collaborative Agreement Adjusted Contract Value                   $ 234,852  
National Institute of Allergy and Infectious Diseases [Member]                      
Proceeds from awards for Research and Development Contracts   $ 5,000             $ 26,346    
Expected Receivable From Awards for Research and Development Contracts                 $ 30,472    
Collaborative Agreement Period of Contract                 5 years    
UAB [Member]                      
Period of Agreement                 25 years    
Renewable Period of Agreement                 5 years    
Base Contract [Member]                      
Government Contract Receivable                     $ 12,134
Additional Development Options [Member]                      
Government Contract Receivable                     22,855
ASPRBARDA Contract [Member]                      
Government Contract Receivable                     $ 34,989
Proceeds from awards for Research and Development Contracts               $ 11,157      
Green Cross Corporation [Member]                      
Proceeds from License Fees Received             $ 250        
AECOM and IRL [Member]                      
Milestone Payment Maximum                 $ 4,000    
Milestone Payment Minimum                 1,400    
Annual License Fee Minimum               150 150    
Annual License Fee Maximum               $ 500 $ 500    
Advance Notice Period for Termination of Agreement                 60 days    
Stock Issued During Period, Value, for Modification of License Agreement       $ 5,911              
Payments for Modification of License Agreement       $ 90              
CSL Limited [Member                      
Proceeds from License Fees Received $ 33,740                    
Milestone Payment Maximum $ 12,000                    
Royalty Term 10 years