Note 2 - Marketable Securities (Tables)

12 Months Ended

Mar. 01, 2015

Investments, Debt and Equity Securities [Abstract]

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

	March 1, 2015
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	119,493	$	119,493	$	-	$	-
U.S. corporate debt securities		11,102		7,084		4,018		-
Total marketable securities	$	130,595	$	126,577	$	4,018	$	-

	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	$	-

Schedule of Unrealized Loss on Investments [Table Text Block]

	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses
March 1, 2015:
U.S. Treasury and other government securities	$	119,191	$	314	$	12
U.S. corporate debt securities		11,097		5		-
Total marketable securities	$	130,288	$	319	$	12
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

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

	Fiscal Year
	2015		2014		2013
Gross realized gains on sale	$	17	$	26	$	9
Gross realized losses on sale		44		209		35

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less	$	73,972
Due after one year through five years		56,623
	$	130,595