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Note 8 - Stock-based Compensation (Details Textual) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 03, 2022
Jul. 04, 2021
Jul. 03, 2022
Jul. 04, 2021
Share-Based Payment Arrangement, Amount Capitalized $ 0 $ 0 $ 0 $ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 0 0 0 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Forfeitures and Expirations in Period, Total (in shares)     0 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercises in Period (in shares)     0 0
Share-Based Payment Arrangement, Expense $ 477 $ 202 $ 860 $ 570
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Net of Forfeitures, Fair Value 0   0  
Employee Stock Purchase Plan [Member]        
Employee Stock Ownership Plan (ESOP), Compensation Expense 11 36 34 66
Share-Based Payment Arrangement, Option [Member]        
Share-Based Payment Arrangement, Expense     0 0
RSUs and PRSUs [Member]        
Share-Based Payment Arrangement, Expense 500 200 900 600
Restricted Stock Units (RSUs) [Member]        
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 1,100 $ 200 $ 1,100 $ 200
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year)     1 year 5 months 19 days