Note 11 - Pensions - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jul. 02, 2016		Jun. 27, 2015	Jul. 02, 2016	Jun. 27, 2015
United States Pension Plan of US Entity [Member]
Service cost		[1]	$ 250		$ 500
Interest cost		[1]	1,031		2,062
Expected return on plan assets		[1]	(916)		(1,832)
Amortization of net loss		[1]	290		580
Total cost (credit) of the plan		[1]	655		1,310
Net periodic benefit cost (credit)		[1]	655		1,310
Foreign Pension Plan [Member]
Service cost	333		315	665	630
Interest cost	496		513	993	1,026
Expected return on plan assets	(520)		(601)	(1,040)	(1,201)
Amortization of net loss	73		62	146	123
Total cost (credit) of the plan	382		289	764	578
Net periodic benefit cost (credit)	$ 382		$ 289	$ 764	$ 578

[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.