Note 7 - Merger (Detail) (USD $)	0 Months Ended	1 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Nov. 08, 2012	Nov. 30, 2012	Dec. 31, 2012	Dec. 31, 2012 General and Administrative Expense [Member]	Dec. 31, 2012 General and Administrative Expense [Member]	Dec. 31, 2012 Minimum [Member] Nabi	Dec. 31, 2012 Maximum [Member] Nabi	Dec. 31, 2012 Nabi	Dec. 31, 2012 Biota Holdings Limited
Stockholders' Equity, Reverse Stock Split	1:6	1:6
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number (in Shares)								500,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares)			0.1249539870
Business Acquisition, Percentage of Voting Interests Acquired								17.00%	83.00%
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price (in Dollars per share)						$ 11.34	$ 99.91
Fair Value Assumptions, Expected Volatility Rate						78.79%	99.62%
Fair Value Assumptions, Risk Free Interest Rate						0.12%	0.87%
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term						109 days	6 years 36 days
Cash Acquired from Acquisition, Net (in Dollars)			$ 27,000,000
Business Combination, Bargain Purchase, Gain Recognized, Amount (in Dollars)			7,800,000
Business Combination, Acquisition Related Costs (in Dollars)			$ 6,500,000	$ 1,300,000	$ 4,600,000