Note 10 - Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 27, 2014
Components of net periodic benefit cost:
Service cost	$ 1,509	$ 1,574
Interest cost	1,662	4,828
Total cost (credit) of the plan for the year	1,500	32,400	$ 300
United States Pension Plan of US Entity [Member]
Components of net periodic benefit cost:
Service cost		750	600
Interest cost		3,093	3,884
Expected return on plan assets		(2,749)	(5,646)
Amortization of prior service (credit)
Amortization of losses		870	549
Total cost (credit) of the plan for the year		1,964	(613)
Expected plan participants’ contributions
Net periodic benefit cost (credit)		1,964	(613)
Curtailment/Settlement loss (gain)		29,928
Total expense (income) for the year		31,892	(613)
Foreign Pension Plan [Member]
Components of net periodic benefit cost:
Service cost	1,509	824	925
Interest cost	1,662	1,735	2,060
Expected return on plan assets	(1,935)	(2,346)	(2,292)
Amortization of losses	306	221	216
Total cost (credit) of the plan for the year	1,542	434	909
Expected plan participants’ contributions
Net periodic benefit cost (credit)	1,542	434	909
Curtailment/Settlement loss (gain)	(36)
Total expense (income) for the year	$ 1,506	$ 434	$ 909