Note 3 - Marketable Securities (Tables)

9 Months Ended

Nov. 27, 2016

Notes Tables

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

	November 27, 2016
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	113,340	$	113,340	$	-	$	-
U.S. corporate debt securities		19,010		19,010		-		-
Total marketable securities	$	132,350	$	132,350	$	-	$	-

	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
November 27, 2016:
U.S. Treasury and other government securities	$	113,781	$	139	$	580
U.S. corporate debt securities		19,040		-		30
Total marketable securities	$	132,821	$	139	$	610
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	$	64,415
Due after one year through five years		67,935
	$	132,350