Note 8 - Stock-based Compensation - Schedule of Allocation of Recognized Period Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2023	Oct. 02, 2022	Oct. 01, 2023	Oct. 02, 2022
Total costs and expenses	$ 616	$ 487	$ 1,917	$ 1,347
Cost of Sales [Member]
Total costs and expenses	73	44	239	217
Research and Development Expense [Member]
Total costs and expenses	171	149	513	325
Selling, General and Administrative Expenses [Member]
Total costs and expenses	$ 372	$ 294	$ 1,165	$ 805