Note 10 - Benefit Plans (Details Textual) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Jan. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Dec. 31, 2016	Jan. 02, 2016	Dec. 27, 2014
Define Benefit Plan, Pre-tax Settlement Charge					$ 29,928
Premium Refund of Annuity Contract	$ 300	$ 300		300
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements					29,900
Defined Benefit Plan Total Cost Credit Of The Plan				1,500	$ 32,400	300
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year				300
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay					4.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount				3,200	$ 2,800	2,100
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent					90.00%
Minimum [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay					4.00%
United States Pension Plan of US Entity [Member]
Pension Contributions			$ 9,100
Define Benefit Plan, Pre-tax Settlement Charge			$ 30,200
Defined Benefit Plan Total Cost Credit Of The Plan					$ 1,964	$ (613)
Defined Benefit Plan, Accumulated Benefit Obligation				51,300
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets					6.80%	6.80%
Foreign Pension Plan [Member]
Defined Benefit Plan Total Cost Credit Of The Plan				$ 1,542	$ 434	$ 909
Defined Benefit Plan, Accumulated Benefit Obligation	$ 46,200	$ 46,200			$ 46,200
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets				4.90%	5.10%	4.90%