Note 12 - Pensions - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Oct. 01, 2016		Sep. 26, 2015	Oct. 01, 2016	Sep. 26, 2015
United States Pension Plan of US Entity [Member]
Service cost		[1]	$ 250		$ 750
Interest cost		[1]	1,032		3,094
Expected return on plan assets			(917)		(2,749)
Amortization of net loss		[1]	290		870
Total cost (credit) of the plan		[1]	655		1,965
Net periodic benefit cost (credit)		[1]	655		1,965
Pension settlement expense			30,194		30,194
Total pension cost (credit)			30,849		32,159
Foreign Pension Plan [Member]
Service cost	332		314	997	944
Interest cost	496		512	1,489	1,538
Expected return on plan assets	(520)		(599)	(1,560)	(1,800)
Amortization of net loss	74		62	220	185
Total cost (credit) of the plan	382		289	1,146	867
Net periodic benefit cost (credit)	382		289	1,146	867
Pension settlement expense
Total pension cost (credit)	382		289	1,146	867
Pension settlement expense			$ 30,194		$ 30,194

[1] The U.S. pension plan was terminated effective July 30, 2014 and, following receipt of a favorable Letter of Determination from the IRS (dated April14, 2015), all liabilities of the plan were settled during the third quarter of fiscal 2015.