Note 2 - Marketable Securities (Tables)

12 Months Ended

Feb. 26, 2023

Notes Tables

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

	February 26, 2023
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	83,859	$	83,859	$	-	$	-
U.S. corporate debt securities		17,344		17,344		-		-
Total marketable securities	$	101,203	$	101,203	$	-	$	-

	February 27, 2021
	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	$	-	$	-

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

	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses
February 26, 2023:
U.S. Treasury and other government securities	$	89,603	$	-	$	5,744
U.S. corporate debt securities		17,414		-		70
Total marketable securities	$	107,017	$	-	$	5,814
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

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

	Fiscal Year
	2023		2022		2021
Gross realized gains on sale	$	-	$	26	$	155
Gross realized losses on sale	$	5	$	36	$	145

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less	$	30,625
Due after one year through five years		70,578
	$	101,203