Note 8 - Stock-based Compensation - Schedule of Allocation of Recognized Period Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2022	Oct. 03, 2021	Oct. 02, 2022	Oct. 03, 2021
Total costs and expenses	$ 487	$ 885	$ 1,347	$ 1,455
Cost of Sales [Member]
Total costs and expenses	44	78	217	132
Research and Development Expense [Member]
Total costs and expenses	149	282	325	521
Selling, General and Administrative Expenses [Member]
Total costs and expenses	$ 294	$ 525	$ 805	$ 802