Note 3 - Marketable Securities (Tables)

6 Months Ended

Aug. 30, 2015

Notes Tables

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

	August 30, 2015
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	108,384	$	108,384	$	-	$	-
U.S. corporate debt securities		31,700		31,700		-		-
Total marketable securities	$	140,084	$	140,084	$	-	$	-

	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	$	-

Schedule of Unrealized Loss on Investments [Table Text Block]

	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses
August 30, 2015:
U.S. Treasury and other government securities	$	108,055	$	356	$	27
U.S. corporate debt securities		31,790		-		90
Total marketable securities	$	139,845	$	356	$	117
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

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less	$	62,815
Due after one year through five years		77,269
	$	140,084