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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
	Mar. 29, 2025	Mar. 30, 2024
Customers individually representing more than 10% of net sales	1	1
One Customer [Member]
Percentage of net sales	11.00%	10.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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