Note 5 - Investments in Privately-held Companies - Value of Investments In Privately-held Companies (Details) - USD ($) $ in Thousands	Jan. 28, 2017	Jan. 30, 2016
Equity investments	$ 2,000	$ 2,884
Issuer A [Member]
Equity investments	2,000	2,000
Issuer B [Member]
Equity investments		750
Issuer C [Member]
Equity investments		$ 134

The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LongTermInvestments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant