Note 14 - Restructuring Charges (Details Textual) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 30, 2018 USD ($)	Apr. 02, 2017 USD ($)	Jan. 01, 2017 USD ($)	Dec. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2017 USD ($)
Restructuring and Related Cost, Expected Number of Positions Eliminated	200
Restructuring Costs and Asset Impairment Charges, Total	$ 20,500	$ 7,300
Severance Costs	10,800
Asset Impairment Charges, Total	8,600			$ 8,569	$ 0	$ 0
Other Restructuring Costs	1,100
Restructuring and Related Cost, Expected Cost, Total	12,000			12,000
Expected Cash Payment of Severance Costs	10,800			$ 10,800
Effect on Future Earnings, Amount	$ 12,000
Restructuring and Related Cost, Number of Positions Eliminated			70
Restructuring Charges, Total		$ 7,300	$ 19,800