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

6 Months Ended

Jun. 25, 2022

Notes Tables

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

		June 25, 2022
						Gross				Gross				Estimated
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses⁽¹⁾				Value
Corporate debt securities⁽²⁾		$	63,577			$	3			$	365			$	63,215
U.S. treasury securities			8,722				-				105				8,617
Bank certificates of deposit			10,750				1				32				10,719
Foreign government security			841				-				-				841
Asset-backed securities			4,138				-				35				4,103
		$	88,028			$	4			$	537			$	87,495

		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]

		June 25, 2022								December 25, 2021
		Amortized				Estimated				Amortized				Estimated
		Cost				Fair Value				Cost				Fair Value
Due in one year or less		$	71,917			$	71,636			$	83,429			$	83,408
Due after one year through three years			16,111				15,859				6,309				6,296
		$	88,028			$	87,495			$	89,738			$	89,704

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

		Fair value measurements at June 25, 2022 using:
														Total estimated
		Level 1				Level 2				Level 3				fair value
Cash		$	221,695			$	-			$	-			$	221,695
U.S. treasury securities			-				8,618				-				8,618
Corporate debt securities			-				70,207				-				70,207
Asset-backed securities			-				4,103				-				4,103
Money market funds			-				51,898				-				51,898
Bank certificates of deposit			-				10,719				-				10,719
Foreign government security			-				841				-				841
		$	221,695			$	146,386			$	-			$	368,081

		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