Note 2 - Marketable Securities (Tables)

12 Months Ended

Mar. 01, 2020

Notes Tables

Debt Securities, Available-for-sale [Table Text Block]

	March 1, 2020
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	101,390	$	101,390	$	-	$	-
U.S. corporate debt securities		15,555		15,555		-		-
Total marketable securities	$	116,945	$	116,945	$	-	$	-

	March 3, 2019
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	68,718	$	68,718	$	-	$	-
U.S. corporate debt securities		11,899		11,899		-		-
Total marketable securities	$	80,617	$	80,617	$	-	$	-

Schedule of Available-for-sale Securities Reconciliation [Table Text Block]

	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses
March 1, 2020:
U.S. Treasury and other government securities	$	100,626	$	764	$	-
U.S. corporate debt securities		15,473		82		-
Total marketable securities	$	116,099	$	846	$	-
March 3, 2019:
U.S. Treasury and other government securities	$	68,727	$	44	$	53
U.S. corporate debt securities		11,924		7		32
Total marketable securities	$	80,651	$	51	$	85

Realized Gain (Loss) on Investments [Table Text Block]

	Fiscal Year
	2020		2019		2018
Gross realized gains on sale	$	90	$	-	$	-
Gross realized losses on sale	$	75	$	1,498	$	1,342

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less	$	43,498
Due after one year through five years		73,447
	$	116,945