Note 16 - Restructuring and Asset Impairment Charges (Details Textual) $ in Thousands		3 Months Ended
	Dec. 29, 2018 USD ($)	Dec. 30, 2018 USD ($)	Mar. 31, 2019 USD ($)
Restructuring and Related Cost, Number of Positions Eliminated	200
Restructuring Charges, Total		$ 20,500
Severance Costs		10,800
Asset Impairment Charges, Total		8,600
Other Restructuring Costs		$ 1,100
Restructuring and Related Cost, Expected Cost Remaining			$ 12,000
Restructuring, Expected Savings			12,000
Employee Severance [Member]
Restructuring Charges, Total	$ 10,816
Restructuring and Related Cost, Expected Cost Remaining			$ 10,800