Note 7 - Restructuring Charges (Details Textual) - Fiscal 2018 Plan [Member] $ in Thousands		3 Months Ended	9 Months Ended
	Mar. 24, 2017	Oct. 28, 2017 USD ($)	Oct. 28, 2017 USD ($)
Asset Impairment Charges		$ 6,663	$ 9,669
Purchased IP and Mask Sets [Member]
Asset Impairment Charges		$ 6,700	$ 9,700
Minimum [Member]
Restructuring and Related Cost, Expected Number of Positions Eliminated	200
Maximum [Member]
Restructuring and Related Cost, Expected Number of Positions Eliminated	250