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Note 9 - Stock Based Awards (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 01, 2021
Mar. 20, 2014
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value     $ 1,000 $ 600
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)     $ 4.43 $ 4.69
Share-based Payment Arrangement, Option [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)     4 years  
Share-based Payment Arrangement, Expense, Tax Benefit     $ 0  
Share-based Goods and Nonemployee Services Transaction, Modification of Terms, Incremental Compensation Cost       $ 400
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total     $ 3,600  
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     2 years 7 months 6 days  
The 2019 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)     1,857,990  
Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Outstanding Stock Maximum 4.50%      
Employee Stock Purchase Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   2,500    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized, Percentage   1.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares)   50,000