Note 3 - Marketable Securities (Tables)

9 Months Ended

Nov. 29, 2015

Notes Tables

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

	November 29, 2015
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	125,146	$	125,146	$	-	$	-
U.S. corporate debt securities		27,762		27,762		-		-
Total marketable securities	$	152,908	$	152,908	$	-	$	-

	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
November 29, 2015:
U.S. Treasury and other government securities	$	125,093	$	209	$	156
U.S. corporate debt securities		27,836		-		74
Total marketable securities	$	152,929	$	209	$	230
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	$	60,041
Due after one year through five years		92,867
	$	152,908