Note 2 - Marketable Securities (Details) - Summary of Unrealized Gains/Losses on Available-for-Sale Securities (USD $) In Thousands, unless otherwise specified	12 Months Ended
Mar. 01, 2015	Mar. 02, 2014
Note 2 - Marketable Securities (Details) - Summary of Unrealized Gains/Losses on Available-for-Sale Securities [Line Items]
Unamortized cost basis	$ 130,288	$ 136,994
Gross unrealized gains	319	213
Gross unrealized losses	12	1
US Treasury and Government [Member]
Note 2 - Marketable Securities (Details) - Summary of Unrealized Gains/Losses on Available-for-Sale Securities [Line Items]
Unamortized cost basis	119,191	112,593
Gross unrealized gains	314	200
Gross unrealized losses	12
Domestic Corporate Debt Securities [Member]
Note 2 - Marketable Securities (Details) - Summary of Unrealized Gains/Losses on Available-for-Sale Securities [Line Items]
Unamortized cost basis	11,097	24,401
Gross unrealized gains	5	13
Gross unrealized losses		$ 1

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

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 210.5-02.2)

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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