Note 4 - Restructuring Charges - Charges Related to the Wind Down Plan (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 01, 2023	Mar. 26, 2022
Costs accrued	$ 888	$ 576
MCT Integration Program [Member]
Costs accrued	900
Xcerra Integration Program [Member]
Costs accrued		400
Employee Severance [Member] | MCT Integration Program [Member]
Accrued restructuring, balance	0
Costs accrued	878
Amounts paid or charged	(707)
Accrued restructuring, balance	171
Employee Severance [Member] | Xcerra Integration Program [Member]
Accrued restructuring, balance		348
Costs accrued		(14)
Amounts paid or charged		(257)
Accrued restructuring, balance		75
Impact of currency exchange		(2)
Other Restructuring [Member] | MCT Integration Program [Member]
Accrued restructuring, balance	0
Costs accrued	10
Amounts paid or charged	(10)
Accrued restructuring, balance	0
Other Restructuring [Member] | Xcerra Integration Program [Member]
Accrued restructuring, balance		0
Costs accrued		590
Amounts paid or charged		(169)
Accrued restructuring, balance		421
Impact of currency exchange		0
Employee Severance and Other Exit Costs [Member] | MCT Integration Program [Member]
Accrued restructuring, balance	0
Costs accrued	888
Amounts paid or charged	(717)
Accrued restructuring, balance	$ 171
Employee Severance and Other Exit Costs [Member] | Xcerra Integration Program [Member]
Accrued restructuring, balance		348
Costs accrued		576
Amounts paid or charged		(426)
Accrued restructuring, balance		496
Impact of currency exchange		$ (2)