Note 1 - Summary of Significant Accounting Policies - Significant Customer Concentration Information (Details) - Customer Concentration Risk [Member] - Revenue Benchmark [Member] - Semiconductor Test and Inspection [Member]	3 Months Ended
	Apr. 01, 2023	Mar. 26, 2022
Customers individually accounting for more than 10% of net sales	2	1
One Customer [Member]
Percentage of net sales	24.00%	11.00%