Note 2 - Marketable Securities (Details) - Summary of Realized Gains/Losses on Available-for-Sale Securities (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 01, 2015	Mar. 02, 2014	Mar. 03, 2013
Summary of Realized Gains/Losses on Available-for-Sale Securities [Abstract]
Gross realized gains on sale	$ 17	$ 26	$ 9
Gross realized losses on sale	$ 44	$ 209	$ 35

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563

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