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

12 Months Ended

Dec. 28, 2024

Notes Tables

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

		At December 28, 2024
						Gross				Gross				Estimated
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses ⁽¹⁾				Value
Corporate debt securities ⁽²⁾		$	32,040			$	37			$	25			$	32,052
U.S. treasury securities			11,964				12				15				11,961
Bank certificates of deposit			6,971				4				3				6,972
Asset-backed securities			3,647				6				-				3,653
Foreign government security			714				-				-				714
Municipal securities			330				3				-				333
		$	55,666			$	62			$	43			$	55,685

		At 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]

		Amortized				Estimated
(in thousands)		Cost				Fair Value
Due in 1 year or less		$	47,819			$	47,855
Due after 1 year through 5 years			7,847				7,830
		$	55,666			$	55,685

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

		Fair value measurements at December 28, 2024 using:
														Total estimated
		Level 1				Level 2				Level 3				fair value
Cash		$	136,965			$	-			$	-			$	136,965
Money market funds			-				69,442				-				69,442
Corporate debt securities			-				32,052				-				32,052
U.S. treasury securities			-				11,961				-				11,961
Bank certificates of deposit			-				6,972				-				6,972
Asset-backed securities			-				3,653				-				3,653
Foreign government security			-				714				-				714
Municipal securities			-				333				-				333
		$	136,965			$	125,127			$	-			$	262,092

		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
Municipal securities			-				335				-				335
Foreign government security			-				741				-				741
		$	157,697			$	178,001			$	-			$	335,698