Note 12 - Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Jun. 30, 2016	Oct. 31, 2015	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Operating Leases, Rent Expense, Total			$ 3,700	$ 3,700	$ 4,000
Purchase Commitment, Remaining Minimum Amount Committed			18,900
Purchase Commitment, Attributable to Operations Held for Sale			7,600
Cost of Revenue, Total			$ 41,446	78,936	71,228
Percentage of Royalties			4.50%
Accrued Royalties			$ 1,200
Compliance Audit Settlement, Current			2,100
Research and Development [Member]
Proceeds from Grantors			5,200
Royalty [Member]
Cost of Revenue, Total			2,400	$ 5,000	$ 4,200
Licensed Technology from Supplier One [Member]
Long-term Purchase Commitment, Amount		$ 6,100	2,100
Remaining Long Term Purchase Commitment Amount			1,500
Design Tool Licenses from Supplier One [Member]
Long-term Purchase Commitment, Amount	$ 7,800		3,000
Remaining Long Term Purchase Commitment Amount			$ 3,900
Primary Facility in Fremont, California [Member]
Lessee, Operating Lease, Term of Contract			6 years 270 days