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Note 8 - Stock-based Compensation - Schedule of Allocation of Recognized Period Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 03, 2022
Jul. 04, 2021
Jul. 03, 2022
Jul. 04, 2021
Total costs and expenses $ 477 $ 202 $ 860 $ 570
Cost of Sales [Member]        
Total costs and expenses 117 18 173 54
Research and Development Expense [Member]        
Total costs and expenses 91 82 176 239
Selling, General and Administrative Expenses [Member]        
Total costs and expenses $ 269 $ 102 $ 511 $ 277