Note 6 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	1 Months Ended		3 Months Ended
	Jun. 30, 2016	Oct. 31, 2015	Apr. 29, 2017	Apr. 30, 2016
Purchase Commitment, Remaining Minimum Amount Committed			$ 20.2
Percentage of Royalties			4.50%
Accrued Royalties			$ 1.2
Research and Development [Member]
Proceeds from Grantors			5.2
Cost of Sales [Member]
Direct Operating Cost, Royalty Expense			0.6	$ 1.3
Licensed Technology from Supplier One [Member]
Remaining Long Term Purchase Commitment Amount			3.0
Long-term Purchase Commitment, Amount		$ 6.1
Licensed Technology from Supplier Two [Member]
Long-term Purchase Commitment, Amount			2.5
Design Tool Licenses from Supplier One [Member]
Remaining Long Term Purchase Commitment Amount			5.9
Long-term Purchase Commitment, Amount	$ 7.8
Design Tool Licenses from Supplier Two [Member]
Long-term Purchase Commitment, Amount			$ 0.6