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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
The 2014 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     704,000  
Share-based Compensation Arrangement by Share-based Payment Award Number of Annual Additional Shares Percentage     4.00%  
The Plans [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
The Plans [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years  
The 2006 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term     10 years  
The 2014 Employee Stock Purchase Plan [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award Number of Annual Additional Shares Percentage     1.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized     281,000  
The 2014 Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 304,991 304,991 140,500  
Share-based Compensation Arrangement by Share-based Payment Award Number of Annual Additional Shares Percentage 1.00% 1.00%    
Allocated Share-based Compensation Expense   $ 32,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized   164,491    
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 1,768 7,632    
Common Stock, Capital Shares Reserved for Future Issuance 297,359 297,359 140,500  
Employee Stock Option [Member] | Non-Employees [Member]        
Allocated Share-based Compensation Expense   $ 2,000 $ 4,000 $ 32,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term   5 years 109 days    
Allocated Share-based Compensation Expense   $ 2,164,000 $ 459,000 $ 155,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   1,010,256 659,865 3,150
Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price   $ 13.52    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 9.34 $ 4.07 $ 16.50
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   $ 500,000 $ 200,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 9,600,000 $ 9,600,000    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition   3 years    
Common Stock, Capital Shares Reserved for Future Issuance 2,717,260 2,717,260 1,947,849