Note 4 - Restructuring Charges - Charges Related to the Wind Down Plan (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 25, 2022	Jul. 01, 2023	Jun. 25, 2022
Costs accrued	$ 416	$ 7	$ 1,304	$ 583
Employee Severance [Member] | MCT Integration Program [Member]
Accrued restructuring, balance			0
Costs accrued			1,217
Amounts paid or charged			(813)
Accrued restructuring, balance	404		404
Employee Severance [Member] | Xcerra Integration Program [Member]
Accrued restructuring, balance				348
Costs accrued				(15)
Amounts paid or charged				(269)
Impact of currency exchange				(4)
Accrued restructuring, balance		60		60
Other Restructuring [Member] | MCT Integration Program [Member]
Accrued restructuring, balance			0
Costs accrued			87
Amounts paid or charged			(49)
Accrued restructuring, balance	38		38
Other Restructuring [Member] | Xcerra Integration Program [Member]
Accrued restructuring, balance				0
Costs accrued				598
Amounts paid or charged				(598)
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			1,304
Amounts paid or charged			(862)
Accrued restructuring, balance	$ 442		$ 442
Employee Severance and Other Exit Costs [Member] | Xcerra Integration Program [Member]
Accrued restructuring, balance				348
Costs accrued				583
Amounts paid or charged				(867)
Impact of currency exchange				(4)
Accrued restructuring, balance		$ 60		$ 60