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Note 8 - Stockholders' Equity (Details) (USD $)
 1 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 28 Months Ended 15 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 1 Months Ended
Nov. 20, 2013
Nov. 30, 2013
Jul. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jan. 13, 2014
Subsequent Event [Member]
Scenario, Previously Reported [Member]
Jan. 13, 2014
Subsequent Event [Member]
Common Stock [Member]
Jan. 13, 2014
Subsequent Event [Member]
Oct. 31, 2009
Maximum Additional Purchase [Member]
Common Stock [Member]
Private Placement 2009 [Member]
Nov. 20, 2013
Sold At Public Offering [Member]
Common Stock [Member]
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock [Member]
Oct. 31, 2009
Private Placement 2009 [Member]
Warrant [Member]
Nov. 06, 2009
Common Stock [Member]
Form S-3 Registration Statement [Member]
Private Placement 2009 [Member]
Jun. 30, 2010
Common Stock [Member]
Form S-3 Registration Statement [Member]
Private Placement 2009 [Member]
Oct. 31, 2009
Common Stock [Member]
Private Placement 2009 [Member]
Jun. 30, 2011
Common Stock [Member]
Private Placement 2011 [Member]
Jul. 30, 2012
Common Stock [Member]
Private Placement 2012 [Member]
Dec. 05, 2013
Common Stock [Member]
Jefferies LLC [Member]
Nov. 20, 2013
Common Stock [Member]
Jefferies LLC [Member]
Dec. 31, 2013
Common Stock [Member]
Dec. 31, 2012
Common Stock [Member]
Dec. 31, 2011
Common Stock [Member]
Oct. 31, 2009
Warrant [Member]
Private Placement 2009 [Member]
Dec. 31, 2013
Warrant [Member]
Jun. 30, 2010
Private Placement 2009 [Member]
Oct. 31, 2009
Private Placement 2009 [Member]
Jun. 30, 2011
Private Placement 2011 [Member]
Dec. 31, 2013
Private Placement 2011 [Member]
Sep. 30, 2013
Private Placement 2011 [Member]
Sep. 30, 2013
Private Placement 2012 [Member]
Jul. 30, 2012
Private Placement 2012 [Member]
Jun. 30, 2011
Employee Stock Purchase Plan 1997 [Member]
May 31, 2009
Employee Stock Purchase Plan 1997 [Member]
Dec. 31, 2007
Employee Stock Purchase Plan 1997 [Member]
Dec. 31, 2013
Employee Stock Purchase Plan 1997 [Member]
Dec. 31, 2012
Employee Stock Purchase Plan 1997 [Member]
Dec. 31, 2011
Employee Stock Purchase Plan 1997 [Member]
Jun. 30, 2011
Equity Incentive Plan 2007 [Member]
May 31, 2010
Equity Incentive Plan 2007 [Member]
Dec. 31, 2013
Equity Incentive Plan 2007 [Member]
May 31, 2006
Stock Incentive Plan 2002 [Member]
Oct. 31, 2010
Stock Incentive Plan 2002 [Member]
Jul. 31, 2008
Non-qualified Plan [Member]
Sep. 30, 2007
Non-qualified Plan [Member]
Dec. 31, 2013
Non-qualified Plan [Member]
Note 8 - Stockholders' Equity (Details) [Line Items]                                                                                                
Stockholders' Equity Note, Stock Split, Conversion Ratio               20                                                                                
Common Stock, Shares Authorized       75,000,000 75,000,000   1,500,000,000   75,000,000                                                                              
Stock Issued During Period, Shares, New Issues                                   397,727 8,000,000 5,100,000 206,500 7,500,000 212,000 5,000                                                
Shares Issued, Price Per Share (in Dollars per share)                     $ 8.00             $ 17.60               $ 2.50               $ 10.50                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights       3,968,864           258,264               198,864 4,000,000                                                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Share)       $ 4.35 [1]           $ 19.40               $ 17.60 $ 3.60                                                          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per Item)       $ 4.35 [1]           $ 19.40               $ 17.60 $ 3.60                                                          
Sale of Stock, Price Per Share (in Dollars per share)                             $ 2.50                                                                  
Proceeds from Issuance of Private Placement (in Dollars)     $ 50,500,000                                                   $ 7,900,000     $ 22,800,000                                
Stock Previously Issued During Prior Period, Shares Registered                               376,631 21,096                                                              
Class of Warrant or Right, Underlying Securities Registered (in Dollars)                                 198,864                                                              
Effective Rate Of Liquidated Damages                                                       1.00%       1.00% 1.50%                              
Private Placement Capped Penatly                                                       8.00%       6.00% 9.00%                              
(in Dollars)           22,772,000                                     80,000         24,000,000                                    
Shares Available Per Warrant Exercised                                     0.5                                                          
Exercise Price Arrangement, Warrants To Purchase Shares, Purchase Price Per Unit (in Dollars per Share)                                                           $ 3.00                                    
Limitation On Exercisable Warrants                                                               9.99%                                
Payments of Stock Issuance Costs (in Dollars)                                                               1,200,000 3,100,000                              
Proceeds from Warrant Exercises (in Dollars)       600,000                                                     600,000                                  
Stock Issued During Period, Value, New Issues (in Dollars)                                       53,600,000     2,000 1,000     600,000                                          
Proceeds from Issuance of Common Stock (in Dollars) 56,300,000 57,800,000   57,802,000 50,491,000                               1,500,000                       50,500,000                              
Common Stock, Capital Shares Reserved for Future Issuance       22,023,232                                   1,125,000                               16,651 22,285 26,559                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized                                                                     25,000 10,000 5,000       4,500,000 100,000   5,000   50,000 50,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized                                                                           50,000         4,750,000   21,250     103,125
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Employee Earnings Withheld to Purchase Common Stock,Percent                                                                           10.00%                    
Share-based Compensation Arrangement by Share-based Payment Award, Discount on Stock Purchase Price                                                                           85.00%                    
Share-based Compensation Arrangement by Share-based Payment Award, Eligible Participants, Percent                                                                           9.00%                    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period                                                                           5,634 4,274 3,899                
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)                                                                           $ 7.23 $ 5.20 $ 4.00                
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price (in Dollars per share)       $ 5.20                                                                   $ 6.12 $ 5.20 $ 4.00                
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period       10 years                                                                                        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years                                                                                        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars)       39,100,000                                                                                        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition       2 years 200 days                                                                                        
Proceeds from Stock Options Exercised (in Dollars)       2,793,000 0 0                                                                                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value (in Dollars)       1,700,000 0 0                                                                                    
Share-based Compensation (in Dollars)       $ 10,890,000 $ 5,732,000 $ 1,890,000           $ 0 $ 0 $ 98,000                                                                    
[1] Average exercise price