Note 2 - Marketable Securities (Details) - Summary of Available-for-Sale Securities (USD $) In Thousands, unless otherwise specified	Mar. 02, 2014	Mar. 03, 2013
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Marketable securities	$ 137,206	$ 89,099
US Treasury and Government [Member] | Fair Value, Inputs, Level 1 [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Marketable securities	112,793	58,299
US Treasury and Government [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Marketable securities	112,793	58,299
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Marketable securities	17,329	20,859
Domestic Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Marketable securities	7,084	9,941
Domestic Corporate Debt Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Marketable securities	24,413	30,800
Fair Value, Inputs, Level 1 [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Marketable securities	130,122	79,158
Fair Value, Inputs, Level 2 [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
Marketable securities	$ 7,084	$ 9,941