Note 7 - Business Combination, Goodwill and Intangible Assets - Acquired Intangible Assets, Subject to Amortization (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016
Gross value	$ 196,466	$ 192,622
Impairment	(65,056)	(64,756)
Accumulated amortization	(100,666)	(90,816)
Net value	30,744	37,050
Developed Technology Rights [Member]
Gross value	85,427	85,427
Impairment	(24,614)	(24,614)
Accumulated amortization	(52,854)	(48,824)
Net value	$ 7,959	$ 11,989
Weighted average remaining amortization period (Year)	7 years 146 days	6 years 182 days
Customer Relationships [Member]
Gross value	$ 54,505	$ 54,505
Impairment	(30,486)	(30,486)
Accumulated amortization	(20,897)	(19,557)
Net value	$ 3,122	$ 4,462
Weighted average remaining amortization period (Year)	5 years 292 days	5 years 255 days
Trademarks and Other [Member]
Gross value	$ 4,078	$ 4,078
Impairment
Accumulated amortization	(3,858)	(3,739)
Net value	$ 220	$ 339
Weighted average remaining amortization period (Year)	1 year 328 days	2 years 328 days
Purchased IP-Amortizing [Member]
Gross value	$ 36,007	$ 32,838
Impairment	(5,516)	(5,516)
Accumulated amortization	(23,057)	(18,696)
Net value	$ 7,434	$ 8,626
Weighted average remaining amortization period (Year)	2 years 109 days	2 years 328 days
Acquired Intangible Assets Subtotal [Member]
Gross value	$ 180,017	$ 176,848
Impairment	(60,616)	(60,616)
Accumulated amortization	(100,666)	(90,816)
Net value	$ 18,735	$ 25,416
Weighted average remaining amortization period (Year)	5 years	5 years 36 days
Purchased Intellectual Property - not yet deployed [Member]
Gross value	$ 16,449	$ 15,774
Impairment	(4,440)	(4,140)
Accumulated amortization
Net value	$ 12,009	$ 11,634