Note 4 - Restructuring Charges - Charges Related to the Wind Down Plan (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Costs accrued	$ 742	$ 17	$ 2,046	$ 600
Employee Severance [Member] | MCT Integration Program [Member]
Accrued restructuring, balance			0
Costs accrued			1,810
Amounts paid or charged			(1,358)
Accrued restructuring, balance	452		452
Employee Severance [Member] | Xcerra Integration Program [Member]
Accrued restructuring, balance				348
Costs accrued				(15)
Amounts paid or charged				(269)
Impact of currency exchange				(9)
Accrued restructuring, balance		55		55
Other Restructuring [Member] | MCT Integration Program [Member]
Accrued restructuring, balance			0
Costs accrued			236
Amounts paid or charged			(236)
Accrued restructuring, balance	0		0
Other Restructuring [Member] | Xcerra Integration Program [Member]
Accrued restructuring, balance				0
Costs accrued				615
Amounts paid or charged				(615)
Impact of currency exchange				0
Accrued restructuring, balance		0		0
Employee Severance and Other Exit Costs [Member] | MCT Integration Program [Member]
Accrued restructuring, balance			0
Costs accrued			2,046
Amounts paid or charged			(1,594)
Accrued restructuring, balance	$ 452		$ 452
Employee Severance and Other Exit Costs [Member] | Xcerra Integration Program [Member]
Accrued restructuring, balance				348
Costs accrued				600
Amounts paid or charged				(884)
Impact of currency exchange				(9)
Accrued restructuring, balance		$ 55		$ 55