Note 2 - Marketable Securities (Tables)

12 Months Ended

Mar. 02, 2014

Investments, Debt and Equity Securities [Abstract]

Schedule of Fair Value of Separate Accounts by Major Category of Investment [Table Text Block]

	March 2, 2014
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	112,793	$	112,793	$	-	$	-
U.S. corporate debt securities		24,413		17,329		7,084	$	-
Total marketable securities	$	137,206	$	130,122	$	7,084	$	-

	March 3, 2013
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	58,299	$	58,299	$	-	$	-
U.S. corporate debt securities		30,800		20,859		9,941	$	-
Total marketable securities	$	89,099	$	79,158	$	9,941	$	-

Schedule of Unrealized Loss on Investments [Table Text Block]

	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses
March 2, 2014:
U.S. Treasury and other government securities	$	112,593	$	200	$	-
U.S. corporate debt securities		24,401		13		1
Total marketable securities	$	136,994	$	213	$	1
March 3, 2013:
U.S. Treasury and other government securities	$	48,293	$	47	$	48
U.S. corporate debt securities		40,859		11		63
Total marketable securities	$	89,152	$	58	$	111

Realized Gain (Loss) on Investments [Table Text Block]

	Fiscal Year
	2014		2013		2012
Gross realized gains on sale	$	26	$	9	$	43
Gross realized losses on sale		209		35		65

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less	$	73,301
Due after one year through five years		63,905
	$	137,206