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Note 7 - Stock-based Compensation (Details Textual) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Apr. 03, 2022
Apr. 04, 2021
Share-Based Payment Arrangement, Amount Capitalized $ 0 $ 0
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Gross (in shares) 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 $ 383 $ 368
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Nonvested, Net of Forfeitures, Fair Value 0  
Employee Stock Purchase Plan [Member]    
Employee Stock Ownership Plan (ESOP), Compensation Expense 23 30
Share-Based Payment Arrangement, Option [Member]    
Share-Based Payment Arrangement, Expense 0 0
RSUs and PRSUs [Member]    
Share-Based Payment Arrangement, Expense 400 300
Restricted Stock Units (RSUs) [Member]    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total $ 1,300 $ 400
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) 1 year 7 months 28 days