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

3 Months Ended

Mar. 30, 2024

Notes Tables

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

		March 30, 2024
						Gross				Gross				Estimated
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses⁽¹⁾				Value
Corporate debt securities⁽²⁾		$	44,509			$	60			$	28			$	44,541
U.S. treasury securities			18,458				4				62				18,400
Bank certificates of deposit			10,290				7				-				10,297
Asset-backed securities			5,953				7				3				5,957
Foreign government security			730				-				-				730
Municipal securities			330				2				-				332
		$	80,270			$	80			$	93			$	80,257

						December 30, 2023
						Gross				Gross				Estimated
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses⁽¹⁾				Value
Corporate debt securities ⁽²⁾		$	45,105			$	147			$	15			$	45,237
U.S. treasury securities			20,439				26				116				20,349
Bank certificates of deposit			15,468				20				-				15,488
Asset-backed securities			8,017				17				10				8,024
Foreign government security			741				-				-				741
Municipal securities			330				5				-				335
		$	90,100			$	215			$	141			$	90,174

Investments Classified by Contractual Maturity Date [Table Text Block]

		March 30, 2024								December 30, 2023
		Amortized				Estimated				Amortized				Estimated
		Cost				Fair Value				Cost				Fair Value
Due in one year or less		$	51,055			$	50,992			$	57,981			$	57,887
Due after one year through five years			28,485				28,535				31,378				31,546
Due after five years through ten years			730				730				741				741
		$	80,270			$	80,257			$	90,100			$	90,174

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

		Fair value measurements at March 30, 2024 using:
														Total estimated
		Level 1				Level 2				Level 3				fair value
Cash		$	135,293			$	-			$	-			$	135,293
Corporate debt securities			-				52,611				-				52,611
Money market funds			-				47,703				-				47,703
U.S. treasury securities			-				18,399				-				18,399
Bank certificates of deposit			-				10,297				-				10,297
Asset-backed securities			-				5,957				-				5,957
Foreign government security			-				730				-				730
Municipal securities			-				332				-				332
		$	135,293			$	136,029			$	-			$	271,322

		Fair value measurements at December 30, 2023 using:
														Total estimated
		Level 1				Level 2				Level 3				fair value
Cash		$	157,697			$	-			$	-			$	157,697
Money market funds			-				81,115				-				81,115
Corporate debt securities			-				51,949				-				51,949
U.S. treasury securities			-				20,349				-				20,349
Bank certificates of deposit			-				15,488				-				15,488
Asset-backed securities			-				8,024				-				8,024
Foreign government security			-				741				-				741
Municipal securities			-				335				-				335
		$	157,697			$	178,001			$	-			$	335,698