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. 02, 2014	Mar. 03, 2013
Note 2 - Marketable Securities (Details) - Summary of Unrealized Gains/Losses on Available-for-Sale Securities [Line Items]
Unamortized cost basis	$ 136,994	$ 89,152
Gross unrealized gains	213	58
Gros unrealized losses	1	111
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	112,593	48,293
Gross unrealized gains	200	47
Gros unrealized losses		48
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	24,401	40,859
Gross unrealized gains	13	11
Gros unrealized losses	$ 1	$ 63