Note 3 - Marketable Securities (Tables)

6 Months Ended

Aug. 28, 2016

Notes Tables

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

	August 28, 2016
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	115,770	$	115,770	$	-	$	-
U.S. corporate debt securities		20,498		20,498		-		-
Total marketable securities	$	136,268	$	136,268	$	-	$	-

	February 28, 2016
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	118,194	$	118,194	$	-	$	-
U.S. corporate debt securities		21,474		21,474		-		-
Total marketable securities	$	139,668	$	139,668	$	-	$	-

Schedule of Unrealized Loss on Investments [Table Text Block]

	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses
August 28, 2016:
U.S. Treasury and other government securities	$	115,655	$	298	$	183
U.S. corporate debt securities		20,517		4		23
Total marketable securities	$	136,172	$	302	$	206
February 28, 2016:
U.S. Treasury and other government securities	$	117,897	$	372	$	74
U.S. corporate debt securities		21,554		-		81
Total marketable securities	$	139,451	$	372	$	155

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less	$	67,498
Due after one year through five years		68,770
	$	136,268