Note 8 - Benefit Plans (Details Textual) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jan. 02, 2016	Oct. 03, 2015	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016
Premium Refund of Annuity Contract	$ 300			$ 300
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement					$ (29,928)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year			300
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year			1,400
Other Assets [Member]
Defined Contribution Plan, Plan Assets			8,000
Other Long-term Liabilities [Member]
Deferred Compensation Arrangement with Individual, Recorded Liability			$ 8,000
401(K) Savings Plan [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			100.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay			4.00%
Defined Contribution Plan, Employer Discretionary Matching Contribution, Percent of Employees' Gross Pay			2.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount			$ 3,500	$ 3,200	$ 2,800
Foreign Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets			4.50%
Pension Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets			4.50%	4.90%
Pension Plan [Member] | UNITED STATES
Payment for Pension Benefits		$ 9,100
Define Benefit Plan, Pre-tax Settlement Charge		$ 30,200
Defined Benefit Plan, Accumulated Benefit Obligation			$ 60,500	$ 51,300
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets					6.80%
Pension Plan [Member] | Foreign Plan [Member]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets					5.10%
Supplemental Employee Retirement Plan [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount			$ 300