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		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023
Customers individually accounting for more than 10% of net sales	2	1	1
One Customer [Member]
Percentage of net sales	22.00%	13.00%	13.00%