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Note 2 - Stock-based Compensation (Details Textual)
$ / shares in Units, shares in Thousands, $ in Thousands
1 Months Ended 6 Months Ended
Dec. 31, 2014
shares
Aug. 31, 2013
shares
Jan. 31, 2013
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
$ / shares
Dec. 31, 2015
shares
Incentive Plan [Member] | Employee Stock Option [Member] | Vest 25% Each Year Until Fully Vested [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period       4 years    
Incentive Plan [Member] | Employee Stock Option [Member] | Non-employee Directors [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, First Vesting Period After Grant Date       1 year    
Incentive Plan [Member] | Employee Stock Option [Member] | Minimum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term       5 years    
Incentive Plan [Member] | Employee Stock Option [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term       10 years    
Incentive Plan [Member] | Stock Options and Restricted Stock [Member] | Vest 50% Each Year Until Fully Vested [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     50.00%      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     2 years      
Incentive Plan [Member] | Performance Shares [Member] | Vest Upon Successful Completion of Specific Development Milestones [Member] | August 2013 [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage       75.00%    
Number of Milestones Achieved       3    
Share-based Compensation Arrangement by Shar-based Payment Award, Awards Unvested, Percentage       25.00%    
Incentive Plan [Member] | Performance Shares [Member] | Vest Upon Successful Completion of Specific Development Milestones [Member] | December 2014 [Member]            
Share-based Compensation Arrangement by Shar-based Payment Award, Awards Unvested, Percentage       100.00%    
Incentive Plan [Member] | Performance Shares [Member] | Vest Upon Successful Completion of Specific Development Milestones [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | shares 1,250 1,032        
Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate       0.00% 0.00%  
Allocated Share-based Compensation Expense       $ 4,402 $ 5,840  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares       $ 2.18 $ 8.21  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares       2,189   16
Employee Stock Purchase Plan [Member]            
Allocated Share-based Compensation Expense       $ 89 $ 94  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized | shares       1,475    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | shares       463    
Percentage of Salary to Purchase Common Stock, Maximum       15.00%    
Percentage of Common Stock Shares, Beginning       85.00%    
Percentage of Common Stock Shares, Ending       85.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee | shares       3    
Shar-based Compensation Arrangement by Shar-based Payment Award, Maximum Number of Shares Per Employee, Amount       $ 25    
Stock Issued During Period, Shares, Employee Stock Purchase Plans | shares       34    
Number of Stock-based Compensation Plans       2    
Allocated Share-based Compensation Expense       $ 4,491 $ 5,934  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized       18,417    
Employee Service Share-based Compensation Nonvested Awards Compensation Cost Expected to be Recognized For Remainder of Fiscal Year       3,782    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Expected to be Recognized Year Two       6,966    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Expected to be Recognized Year Three       4,703    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Expected to be Recognized Year Four       2,586    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Expected to be Recognized Year Five       $ 380