Note 12 - Stock-based Compensation - Schedule of Allocation of Recognized Period Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2023	Jan. 02, 2022	Jan. 03, 2021
Total costs and expenses	$ 2,035	$ 2,526	$ 1,739
Employee Stock Purchase Plan [Member]
Total costs and expenses	70	110	39
Share-Based Payment Arrangement, Option [Member]
Total costs and expenses	0	0	39
RSU and PRSU [Member]
Total costs and expenses	1,965	2,416	1,661
Cost of Sales [Member]
Total costs and expenses	272	282	162
Research and Development Expense [Member]
Total costs and expenses	652	843	670
Selling, General and Administrative Expenses [Member]
Total costs and expenses	$ 1,111	$ 1,401	$ 907