Note 7 - Acquired Intangible Assets, Subject to Amortization (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Apr. 30, 2016	Jan. 30, 2016
Developed Technology Rights [Member]
Gross value	$ 85,429	$ 85,427
Impairment	(24,614)	(24,614)
Accumulated amortization and effect of currency translation	(50,041)	(48,824)
Net value	$ 10,774	$ 11,989
Weighted average remaining amortization period	6 years 292 days	6 years 182 days
Customer Relationships [Member]
Gross value	$ 54,505	$ 54,505
Impairment	(30,486)	(30,486)
Accumulated amortization and effect of currency translation	(19,962)	(19,557)
Net value	$ 4,057	$ 4,462
Weighted average remaining amortization period	5 years 255 days	5 years 255 days
Trademarks and Other [Member]
Gross value	$ 4,078	$ 4,078
Impairment
Accumulated amortization and effect of currency translation	$ (3,769)	$ (3,739)
Net value	$ 309	$ 339
Weighted average remaining amortization period	2 years 255 days	2 years 328 days
Purchased IP-Amortizing [Member]
Gross value	$ 34,067	$ 32,838
Impairment	(5,516)	(5,516)
Accumulated amortization and effect of currency translation	(19,823)	(18,696)
Net value	$ 8,728	$ 8,626
Weighted average remaining amortization period	2 years 255 days	2 years 328 days
Acquired Intangible Assets Subtotal [Member]
Gross value	$ 178,079	$ 176,848
Impairment	(60,616)	(60,616)
Accumulated amortization and effect of currency translation	(93,595)	(90,816)
Net value	$ 23,868	$ 25,416
Weighted average remaining amortization period	5 years	5 years 36 days
Purchased Intellectual Property - not yet deployed [Member]
Gross value	$ 15,026	$ 15,774
Impairment	$ (4,140)	$ (4,140)
Accumulated amortization and effect of currency translation
Net value	$ 10,886	$ 11,634
Weighted average remaining amortization period
Gross value	$ 193,105	192,622
Impairment	(64,756)	(64,756)
Accumulated amortization and effect of currency translation	(93,595)	(90,816)
Net value	$ 34,754	$ 37,050
Weighted average remaining amortization period