Note 6 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2016	Oct. 31, 2015	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
Purchase Commitment, Remaining Minimum Amount Committed			$ 14.3		$ 14.3
Percentage of Royalties			4.50%		4.50%
Accrued Royalties			$ 1.2		$ 1.2
Product Warranty, Term					1 year
Research and Development [Member]
Proceeds from Grantors					$ 5.2
Cost of Sales [Member]
Direct Operating Cost, Royalty Expense			0.8	$ 1.6	1.4	$ 2.9
Licensed Technology from Supplier One [Member]
Long-term Purchase Commitment, Amount		$ 6.1
Remaining Long Term Purchase Commitment Amount			3.0		3.0
Licensed Technology from Supplier Two [Member]
Remaining Long Term Purchase Commitment Amount			2.2		2.2
Design Tool Licenses from Supplier One [Member]
Long-term Purchase Commitment, Amount	$ 7.8
Remaining Long Term Purchase Commitment Amount			5.2		5.2
Design Tool Licenses from Supplier Two [Member]
Remaining Long Term Purchase Commitment Amount			$ 1.5		$ 1.5