Note 14 - Segment and Geographical Information - Net Revenue to Each Significant Country Based on the Ship-to Location (Details) $ in Thousands	3 Months Ended
	Apr. 29, 2017 USD ($)
Sales revenue, net	$ 39,564
CHINA
Sales revenue, net, including discontinued operations	21,790
TAIWAN, PROVINCE OF CHINA
Sales revenue, net, including discontinued operations	6,951
UNITED STATES
Sales revenue, net, including discontinued operations	5,520
KOREA, REPUBLIC OF
Sales revenue, net, including discontinued operations	1,675
Rest of the World [Member]
Sales revenue, net, including discontinued operations	$ 3,628