Note 4 - Restructuring Charges - Charges Related to the Wind Down Plan (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Costs accrued	$ 7	$ 617	$ 583	$ 1,957
Integration Program [Member]
Costs accrued			200	2,100
Integration Program [Member] | Employee Severance [Member]
Accrued restructuring, beginning balance			348	5,826
Costs accrued			(15)	1,125
Amounts paid or charged			(269)	(5,321)
Impact of currency exchange			(4)	(64)
Accrued restructuring, ending balance	60	1,566	60	1,566
Integration Program [Member] | Other Restructuring [Member]
Accrued restructuring, beginning balance			0	0
Costs accrued			598	832
Amounts paid or charged			(598)	(832)
Impact of currency exchange			0	0
Accrued restructuring, ending balance	0	0	0	0
Integration Program [Member] | Employee Severance and Other Exit Costs [Member]
Accrued restructuring, beginning balance			348	5,826
Costs accrued			583	1,957
Amounts paid or charged			(867)	(6,153)
Impact of currency exchange			(4)	(64)
Accrued restructuring, ending balance	$ 60	$ 1,566	$ 60	$ 1,566