Note 3 - Marketable Securities - Summary of Realized Gains/Losses on Available-for-Sale Securities (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Nov. 30, 2014	Dec. 01, 2013	Nov. 30, 2014	Dec. 01, 2013
Gross realized gains on sale	$ 5	$ 12	$ 5	$ 23
Gross realized losses on sale		$ 324		$ 485

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