Note 3 - Marketable Securities (Tables)

3 Months Ended

May 27, 2018

Notes Tables

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

	May 27, 2018
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	76,306	$	76,306	$	-	$	-
U.S. corporate debt securities		13,108		13,108		-		-
Total marketable securities	$	89,414	$	89,414	$	-	$	-

	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
May 27, 2018:
U.S. Treasury and other government securities	$	78,101	$	-	$	1,795
U.S. corporate debt securities		13,152		-		44
Total marketable securities	$	91,253	$	-	$	1,839
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	$	24,014
Due after one year through five years		65,400
	$	89,414