Note 12 - Income Taxes (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jan. 02, 2016	Dec. 27, 2014
Income Tax Expense (Benefit)	$ 18,786	$ 26,082	$ 33,546
Income Taxes Paid	35,600	23,300	26,600
Undistributed Earnings of Foreign Subsidiaries	498,000
Deferred Tax Liabilities, Undistributed Foreign Earnings	1,750
Income Tax Examination, Interest Expense	900	200	300
Income Tax Examination, Interest Accrued	2,400	1,500	1,300
Unrecognized Tax Benefits	8,617	3,532	$ 2,550
Federal Ministry of Finance, Germany [Member] | Maximum [Member]
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority	100
CANADA
Income Tax Holiday, Aggregate Dollar Amount	$ 2,700
Income Tax Holiday Expense (Benefit) Amount Per Diluted Share	$ 0.12
Accumulated Defined Benefit Plans Adjustment Attributable to Noncontrolling Interest [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Income Tax Expense (Benefit)		$ 11,700
Carry-back of U.S. Federal Net Operating Loss [Member]
Income Tax Expense (Benefit)	$ 3,000