Note 2 - Marketable Securities (Tables)

12 Months Ended

Feb. 27, 2022

Notes Tables

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

	February 27, 2022
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	62,612	$	62,612	$	-	$	-
U.S. corporate debt securities		34,938		34,938		-		-
Total marketable securities	$	97,550	$	97,550	$	-	$	-

	February 28, 2021
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	56,906	$	56,906	$	-	$	-
U.S. corporate debt securities		18,041		18,041		-		-
Total marketable securities	$	74,947	$	74,947	$	-	$	-

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

	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses
February 27, 2022:
U.S. Treasury and other government securities	$	65,177	$	5	$	2,570
U.S. corporate debt securities		35,064		5		131
Total marketable securities	$	100,241	$	10	$	2,701
February 28, 2021:
U.S. Treasury and other government securities	$	57,400	$	153	$	647
U.S. corporate debt securities		18,008		52		19
Total marketable securities	$	75,408	$	205	$	666

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

	Fiscal Year
	2022		2021		2020
Gross realized gains on sale	$	26	$	155	$	90
Gross realized losses on sale	$	36	$	145	$	75

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less	$	58,582
Due after one year through five years		38,968
	$	97,550