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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 09, 2020
Jan. 01, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 08, 2020
Jan. 01, 2020
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term     36 days          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross     29,563 51,040        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 80 $ 104.32        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 0 $ 0        
Share-based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount     $ 0 $ 4,600        
Common Stock, Capital Shares Reserved for Future Issuance     664,961 684,871        
Share-based Payment Arrangement, Expense     $ 943 $ 3,429        
The 2014 Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized     17,600          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Annual Additional Shares, Percentage     4.00%          
The 2014 Plan [Member] | Minimum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years          
The 2014 Plan [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     4 years          
The Second Amended 2014 Plan [Member] | Subsequent Event [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,074,384         129,088    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 900,003              
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]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   4,811            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Annual Additional Shares, Percentage   1.00% 1.00%          
Common Stock, Capital Shares Reserved for Future Issuance     2,953 2,953       3,513
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Additional Shares Authorizable   281,000            
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period     0 1,859        
Share-based Payment Arrangement, Expense     $ 100 $ 100 $ 100      
The 2014 Employee Stock Purchase Plan [Member] | Subsequent Event [Member]                
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized             5,576  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Annual Additional Shares, Percentage             1.00%