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Note 3 - Merger (Details) (USD $)
In Millions, except Share data, unless otherwise specified
0 Months Ended 3 Months Ended 6 Months Ended
Nov. 08, 2012
Dec. 31, 2012
Dec. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Note 3 - Merger (Details) [Line Items]          
Stockholders' Equity Note, Stock Split, Conversion Ratio 6        
Net closing cash balance (in Dollars) $ 27.0        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) 0.1249539870        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options (in Shares) 500,000     802,470  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price (in Dollars per share)       $ 23.75  
Business Combination, Bargain Purchase, Gain Recognized, Amount (in Dollars) 7.8        
Loss Gain Recorded On Merger (in Dollars)   7.6 0.2 (0.2) 7.6
Business Combination, Bargain Purchase, Gain Recognized, Net Amount (in Dollars)     $ 7.6    
Biota Holdings Limited
         
Note 3 - Merger (Details) [Line Items]          
Ownership Percentage 83.00%        
Nabi
         
Note 3 - Merger (Details) [Line Items]          
Ownership Percentage 17.00%        
Nabi | Minimum [Member]
         
Note 3 - Merger (Details) [Line Items]          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price (in Dollars per share) $ 11.34        
Fair Value Assumptions, Expected Volatility Rate 78.79%        
Fair Value Assumptions, Risk Free Interest Rate 0.12%        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term 109 days        
Nabi | Maximum [Member]
         
Note 3 - Merger (Details) [Line Items]          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price (in Dollars per share) $ 99.91        
Fair Value Assumptions, Expected Volatility Rate 99.62%        
Fair Value Assumptions, Risk Free Interest Rate 0.87%        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term 6 years 36 days