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Note 5 - Stockholders' Equity (Details) (USD $)
9 Months Ended 1 Months Ended 9 Months Ended 28 Months Ended 1 Months Ended 1 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jan. 13, 2014
Jun. 30, 2011
Private Placement 2011 [Member]
Common Stock [Member]
Sep. 30, 2014
Private Placement 2011 [Member]
Common Stock [Member]
Sep. 30, 2014
Private Placement 2011 [Member]
Warrant [Member]
Sep. 30, 2014
Private Placement 2011 [Member]
Sep. 30, 2013
Private Placement 2011 [Member]
Jun. 30, 2011
Private Placement 2011 [Member]
Jul. 31, 2012
Private Placement 2012 [Member]
Common Stock [Member]
Jul. 31, 2012
Private Placement 2012 [Member]
Jun. 30, 2014
Pre Funded Warrants [Member]
Nov. 30, 2013
Common Stock [Member]
Jefferies LLC [Member]
Jun. 30, 2014
Common Stock [Member]
Jun. 30, 2014
Common Stock and Prefunded Warrants [Member]
Jan. 13, 2014
Scenario, Previously Reported [Member]
Jan. 13, 2014
Reverse Stock Split [Member]
Note 5 - Stockholders' Equity (Details) [Line Items]                                  
Stockholders' Equity Note, Stock Split, Conversion Ratio                                 20
Common Stock, Shares Authorized (in Shares)     75,000,000                         1,500,000,000  
Stock Issued During Period, Shares, New Issues (in Shares)       8,000,000 303,614         5,100,000     8,600,000 4,800,000      
Stock Issued During Period, Value, New Issues       $ 22,800,000           $ 50,500,000              
Payments of Stock Issuance Costs       1,200,000           3,100,000     3,900,000   4,000,000    
Shares Available Per Warrant Exercised (in Shares)       0.5                          
Exercise Price Arrangement, Warrants To Purchase Shares, Purchase Price Per Unit (in Dollars per Share)                 $ 3.60                
Limitation On Exercisable Warrants               9.99%                  
Proceeds from Issuance of Common Stock         0               57,800,000        
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised (in Shares)           460,706                      
Proceeds from Warrant Exercises   600,000         600,000                    
Shares Issued, Price Per Share (in Dollars per share)                     $ 10.50            
Sale of Stock, Price Per Share (in Dollars per share)                         $ 8.00 $ 11.75      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)                       600,000          
Share Price (in Dollars per share)                       $ 11.74          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share)                       $ 0.01          
Warrant Term                       7 years          
Proceeds from Issuance or Sale of Equity 58,916,000                           58,900,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Net (in Shares) 550,000                                
Proceeds from Stock Options Exercised 2,832,000 1,120,000                              
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 26,800,000                                
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 6 months