Note 3 - Marketable Securities (Tables)

6 Months Ended

Aug. 26, 2018

Notes Tables

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

	August 26, 2018
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	76,442	$	76,442	$	-	$	-
U.S. corporate debt securities		11,014		11,014		-		-
Total marketable securities	$	87,456	$	87,456	$	-	$	-

	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
August 26, 2018:
U.S. Treasury and other government securities	$	78,086	$	-	$	1,644
U.S. corporate debt securities		11,042		-		28
Total marketable securities	$	89,128	$	-	$	1,672
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	$	30,833
Due after one year through five years		56,623
	$	87,456