Note 3 - Marketable Securities (Tables)

3 Months Ended

May 28, 2017

Notes Tables

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

	May 28, 2017
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	152,280	$	152,280	$	-	$	-
U.S. corporate debt securities		38,207		38,207		-		-
Total marketable securities	$	190,487	$	190,487	$	-	$	-

	February 26, 2017
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	111,261	$	111,261	$	-	$	-
U.S. corporate debt securities		24,891		24,891		-		-
Total marketable securities	$	136,152	$	136,152	$	-	$	-

Schedule of Unrealized Loss on Investments [Table Text Block]

	Amortized Cost Basis		Gross U nrealized Gains		Gross Unrealized Losses
May 28, 2017:
U.S. Treasury and other government securities	$	152,901	$	36	$	657
U.S. corporate debt securities		38,343		-		136
Total marketable securities	$	191,244	$	36	$	793
February 26, 2017:
U.S. Treasury and other government securities	$	111,727	$	136	$	602
U.S. corporate debt securities		24,938		1		48
Total marketable securities	$	136,665	$	137	$	650

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less	$	48,390
Due after one year through five years		142,097
	$	190,487