Note 9 - Pensions (Details Textual) - USD ($) $ in Thousands	6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Dec. 27, 2014
United States Pension Plan of US Entity [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	3.90%	6.75%
Foreign Pension Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets	5.39%	5.14%
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities	$ 11,768		$ 11,768