Note 3 - Marketable Securities (Tables)

9 Months Ended

Nov. 25, 2018

Notes Tables

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

	November 25, 2018
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	74,463	$	74,463	$	-	$	-
U.S. corporate debt securities		20,928		20,928		-		-
Total marketable securities	$	95,391	$	95,391	$	-	$	-

	February 25, 2018
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	78,361	$	78,361	$	-	$	-
U.S. corporate debt securities		11,616		11,616		-		-
Total marketable securities	$	89,977	$	89,977	$	-	$	-

Schedule of Unrealized Loss on Investments [Table Text Block]

	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses
November 25, 2018:
U.S. Treasury and other government securities	$	76,070	$	-	$	1,607
U.S. corporate debt securities		20,977		1		50
Total marketable securities	$	97,047	$	1	$	1,657
February 25, 2018:
U.S. Treasury and other government securities	$	80,116	$	-	$	1,755
U.S. corporate debt securities		11,675		-		59
Total marketable securities	$	91,791	$	-	$	1,814

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less	$	41,802
Due after one year through five years		53,589
	$	95,391