Note 14 - Segment and Geographical Information - Net Revenue to Each Significant Country Based on the Ship-to Location (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Sales revenue, net	$ 42,724	$ 62,729	$ 61,316	$ 53,775	$ 51,450	$ 61,581	$ 58,307	$ 55,912	$ 220,544	$ 227,250	$ 188,313
CHINA
Sales revenue, net									110,195	93,560	70,513
TAIWAN, PROVINCE OF CHINA
Sales revenue, net									51,093	50,301	24,346
UNITED STATES
Sales revenue, net									32,367	41,781	20,587
THAILAND
Sales revenue, net									9,487	13,532	40,703
Rest of the World [Member]
Sales revenue, net									$ 17,402	$ 28,076	$ 32,164