Note 3 - Marketable Securities (Tables)

9 Months Ended

Nov. 29, 2020

Notes Tables

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

	November 29, 2020
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	93,071	$	93,071	$	-	$	-
U.S. corporate debt securities		20,106		20,106		-		-
Total marketable securities	$	113,177	$	113,177	$	-	$	-

	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	$	-	$	-

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

	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses
November 29, 2020:
U.S. Treasury and other government securities	$	92,783	$	497	$	209
U.S. corporate debt securities		20,050		74		18
Total marketable securities	$	112,833	$	571	$	227
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	$	-

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less	$	74,868
Due after one year through five years		38,309
	$	113,177