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

6 Months Ended

Jun. 28, 2025

Notes Tables

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

		June 28, 2025
						Gross				Gross				Estimated
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses⁽¹⁾				Value
Corporate debt securities⁽²⁾		$	21,920			$	15			$	8			$	21,927
Bank certificates of deposit			11,590				3				1				11,592
U.S. treasury securities			7,182				16				4				7,194
Asset-backed securities			3,201				1				1				3,201
Foreign government security			730				-				-				730
Municipal securities			330				1				-				331
		$	44,953			$	36			$	14			$	44,975

			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

Investments Classified by Contractual Maturity Date [Table Text Block]

		June 28, 2025								December 28, 2024
		Amortized				Estimated				Amortized				Estimated
		Cost				Fair Value				Cost				Fair Value
Due in one year or less		$	33,170			$	33,173			$	47,819			$	47,855
Due after one year through five years			11,783				11,802				7,847				7,830
		$	44,953			$	44,975			$	55,666			$	55,685

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

		Fair value measurements at June 28, 2025 using:
														Total Estimated
		Level 1				Level 2				Level 3				Fair Value
Cash		$	121,557			$	-			$	-			$	121,557
Money market funds			-				36,788				-				36,788
Corporate debt securities			-				28,018				-				28,018
Bank certificates of deposit			-				11,592				-				11,592
U.S. treasury securities			-				7,194				-				7,194
Asset-backed securities			-				3,201				-				3,201
Foreign government security			-				730				-				730
Municipal securities			-				331				-				331
		$	121,557			$	87,854			$	-			$	209,411

		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