Note 16 - Segment and Geographical Information (Details Textual) - USD ($) $ in Thousands	12 Months Ended
Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
IoT Devices [Member]
Revenue Recognition, Milestone Method, Revenue Recognized	$ 0	$ 5,000
License and Other [Member]
Percentage of Revenue During Period	0.70%	0.10%	0.00%

The amount of consideration recognized during the period for the milestone or milestones.

No definition available.

Name:	us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration