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Note 5 - Financial Instruments Measured at Fair Value (Tables)

3 Months Ended

Mar. 26, 2022

Notes Tables

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

		March 26, 2022
						Gross				Gross				Estimated
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses⁽¹⁾				Value
Corporate debt securities⁽²⁾		$	77,246			$	1			$	292			$	76,955
U.S. treasury securities			8,713				-				68				8,645
Bank certificates of deposit			4,300				-				10				4,290
Foreign government security			884				-				-				884
Asset-backed securities			731				-				3				728
		$	91,874			$	1			$	373			$	91,502

		December 25, 2021
						Gross				Gross				Estimated
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses⁽¹⁾				Value
Corporate debt securities ⁽²⁾		$	84,060			$	2			$	31			$	84,031
U.S. treasury securities			3,953				-				5				3,948
Bank certificates of deposit			800				-				-				800
Foreign government security			925				-				-				925
		$	89,738			$	2			$	36			$	89,704

Investments Classified by Contractual Maturity Date [Table Text Block]

		March 26, 2022								December 25, 2021
		Amortized				Estimated				Amortized				Estimated
		Cost				Fair Value				Cost				Fair Value
Due in one year or less		$	75,633			$	75,468			$	83,429			$	83,408
Due after one year through three years			16,241				16,034				6,309				6,296
		$	91,874			$	91,502			$	89,738			$	89,704

Fair Value, Assets Measured on Recurring Basis [Table Text Block]

		Fair value measurements at March 26, 2022 using:
														Total estimated
		Level 1				Level 2				Level 3				fair value
Cash		$	156,024			$	-			$	-			$	156,024
U.S. treasury securities			-				8,645				-				8,645
Corporate debt securities			-				79,951				-				79,951
Asset-backed securities			-				728				-				728
Money market funds			-				108,048				-				108,048
Bank certificates of deposit			-				4,290				-				4,290
Foreign government security			-				884				-				884
		$	156,024			$	202,546			$	-			$	358,570

		Fair value measurements at December 25, 2021 using:
														Total estimated
		Level 1				Level 2				Level 3				fair value
Cash		$	195,297			$	-			$	-			$	195,297
Corporate debt securities			-				86,535				-				86,535
U.S. treasury securities			-				3,948				-				3,948
Money market funds			-				92,400				-				92,400
Bank certificates of deposit			-				800				-				800
Foreign government security			-				925				-				925
		$	195,297			$	184,608			$	-			$	379,905