Note 12 - Segment and Geographical Information (Details Textual)	3 Months Ended		6 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
Number of Reportable Segments			1
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Sunjet Components Corporation [Member]
Concentration Risk, Percentage	27.00%	13.00%	21.00%	17.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Silicon Application [Member]
Concentration Risk, Percentage	14.00%	18.00%	15.00%	15.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Arris Global [Member]
Concentration Risk, Percentage	11.00%	18.00%	15.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Arrow Electronics [Member]
Concentration Risk, Percentage		15.00%
License and Other [Member]
Percentage of Revenue During Period		0.20%		0.30%