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Note 5 - Stockholders' Equity (Details Textual) - USD ($)
 1 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Nov. 30, 2013
Jun. 30, 2011
Jun. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Private Placement 2011 [Member] | Common Stock [Member]              
Stock Issued During Period, Shares, New Issues           285,713 303,614
Private Placement 2011 [Member] | Warrant [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised           343,813 460,706
Private Placement 2011 [Member]              
Proceeds from Warrant Exercises         $ 0 $ 0  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       4,000,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights       $ 3.60      
Beneficial Ownership after Conversion       9.99%      
Notice Period Associated with Beneficial Ownership Percentage Limitation Convertible Notes       61 days      
Class of Warrant or Right, Outstanding           2,965,477  
Jefferies, LLC [Member] | Common Stock [Member]              
Stock Issued During Period, Shares, New Issues     7,700,000        
Sale of Stock, Price Per Share     $ 8        
Proceeds from Issuance of Common Stock     $ 57,800,000        
Payments of Stock Issuance Costs     $ 3,900,000        
Common Stock [Member]              
Stock Issued During Period, Shares, New Issues 5,500,000 4,800,000          
Sale of Stock, Price Per Share $ 24.75 $ 11.75     $ 11.75    
Payments of Stock Issuance Costs $ 8,400,000            
Proceeds from Issuance or Sale of Equity $ 128,200,000            
Common Stock and Prefunded Warrants [Member]              
Payments of Stock Issuance Costs   $ 4,000,000          
Proceeds from Issuance or Sale of Equity   $ 58,900,000          
Pre-funded Warrants[Member]              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   600,000     600,000    
Share Price   $ 11.74     $ 11.74    
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 0.01     $ 0.01    
Proceeds from Issuance or Sale of Equity           $ 128,199,000 $ 58,916,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Net           882,579 550,496
Proceeds from Stock Options Exercised           $ 7,915,000 $ 2,832,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period           883,000 719,092
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized           $ 31,150,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition           2 years