Note 3 - Marketable Securities (Tables)

6 Months Ended

Sep. 01, 2019

Notes Tables

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

	September 1, 2019
	Total		Level 1		Level 2		Level 3
U.S. Treasury and other government securities	$	97,064	$	97,064	$	-	$	-
U.S. corporate debt securities		23,060		23,060		-		-
Total marketable securities	$	120,124	$	120,124	$	-	$	-

	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
September 1, 2019:
U.S. Treasury and other government securities	$	96,441	$	657	$	34
U.S. corporate debt securities		23,028		48		16
Total marketable securities	$	119,469	$	705	$	50
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

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less	$	25,595
Due after one year through five years		94,529
	$	120,124