Note 4 - Restructuring Charges - Charges Related to the Wind Down Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2021	Dec. 26, 2020	Dec. 28, 2019
Costs accrued	$ 1,823	$ 7,623	$ 13,484
Integration Program [Member]
Restructuring Charges, Total	1,265	11,354	16,213
Costs accrued	1,300	11,400	16,200
Employee Severance [Member] | Integration Program [Member]
Restructuring Charges, Total	1,161	6,485	12,170
Accrued restructuring, balance	5,826	1,236
Costs accrued	1,161	6,485
Amounts paid or charged	(6,545)	(2,055)
Impact of currency exchange	(94)	160
Accrued restructuring, balance	348	5,826	1,236
Other Restructuring [Member] | Integration Program [Member]
Restructuring Charges, Total	662	1,138	1,314
Accrued restructuring, balance	0	0
Costs accrued	662	1,138
Amounts paid or charged	(662)	(1,138)
Impact of currency exchange	0	0
Accrued restructuring, balance	0	0	0
Employee Severance and Other Exit Costs [Member] | Integration Program [Member]
Accrued restructuring, balance	5,826	1,236
Costs accrued	1,823	7,623
Amounts paid or charged	(7,207)	(3,193)
Impact of currency exchange	(94)	160
Accrued restructuring, balance	348	5,826	1,236
Inventory Charges [Member] | Integration Program [Member]
Restructuring Charges, Total	$ (558)	$ 3,731	$ 2,729