Note 4 - Restructuring Charges - Charges Related to the Wind Down Plan (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2022	Mar. 27, 2021
Costs accrued	$ 576	$ 1,340
Integration Program [Member]
Costs accrued	400	1,700
Integration Program [Member] | Employee Severance [Member]
Accrued restructuring, beginning balance	348	5,826
Costs accrued	(14)	952
Amounts paid or charged	(257)	(2,444)
Impact of currency exchange	(2)	(140)
Accrued restructuring, ending balance	75	4,194
Integration Program [Member] | Other Restructuring [Member]
Accrued restructuring, beginning balance	0	0
Costs accrued	590	388
Amounts paid or charged	(169)	(388)
Impact of currency exchange	0	0
Accrued restructuring, ending balance	421	0
Integration Program [Member] | Employee Severance and Other Exit Costs [Member]
Accrued restructuring, beginning balance	348	5,826
Costs accrued	576	1,340
Amounts paid or charged	(426)	(2,832)
Impact of currency exchange	(2)	(140)
Accrued restructuring, ending balance	$ 496	$ 4,194