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Note 3 - Marketable Securities (Tables)

9 Months Ended

Nov. 28, 2021

Notes Tables

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

		November 28, 2021
		Total				Level 1				Level 2				Level 3

U.S. Treasury and other government securities		$	58,763			$	58,763			$	-			$	-
U.S. corporate debt securities			36,905				36,905				-				-
Total marketable securities		$	95,668			$	95,668			$	-

		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

November 28, 2021:
U.S. Treasury and other government securities		$	59,877			$	18			$	1,132

U.S. corporate debt securities			36,927				15				37
Total marketable securities		$	96,804			$	33			$	1,169

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

Investments Classified by Contractual Maturity Date [Table Text Block]

Due in one year or less		$	57,802
Due after one year through five years			37,866
		$	95,668