Note 9 - Commitments and Contingencies (Details Textual) $ in Millions		1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 08, 2013 USD ($)	Aug. 31, 2015 USD ($)	Oct. 31, 2015 USD ($)	Nov. 01, 2014 USD ($)	May. 03, 2014 USD ($)	Oct. 31, 2015 USD ($)	Nov. 01, 2014 USD ($)	Jan. 31, 2015 USD ($)
Design Tool Licences [Member]
Purchase Commitment, Remaining Minimum Amount Committed			$ 2.7			$ 2.7
Long-term Purchase Commitment, Amount						3.1		$ 12.9
Cost of Sales [Member]
Direct Operating Cost, Royalty Expense			1.2	$ 0.8		$ 3.3	$ 1.9
Additional Expenditures Incurred but Not yet Paid			0.1
Selling and Marketing Expense [Member]
Loss Contingency, Loss in Period					$ 0.1
Additional After Timely First Milestone [Member]
Revenue Recognition, Milestone Method, Revenue Recognized	$ 5.0
The Buyer Vs. the Entity [Member] | Litigation Award, Not Including Legal Costs, Interest, and Other Associated Expenses [Member]
Litigation Settlement, Amount		$ 5.0
The Buyer Vs. the Entity [Member] | Litigation Award, Amount to Recover Legal Costs, Interest, and Other Associated Expenses [Member]
Litigation Settlement, Amount		2.6
The Buyer Vs. the Entity [Member]
Litigation Settlement, Amount		$ 7.6
Product Warranty, Term						1 year
Purchase Commitment, Remaining Minimum Amount Committed			$ 28.2			$ 28.2
Proceeds from Grantors						$ 5.2
Percentage of Royalties			4.50%			4.50%
Accrued Royalties			$ 1.1			$ 1.1
Number of Employees Transferred	21
Loss Contingency Accrual					$ 0.2