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

3 Months Ended

Mar. 29, 2025

Notes Tables

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

		March 29, 2025
						Gross				Gross				Estimated
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses⁽¹⁾				Value
Corporate debt securities⁽²⁾		$	29,426			$	27			$	12			$	29,441
Bank certificates of deposit			9,511				4				1				9,514
U.S. treasury securities			4,727				7				5				4,729
Asset-backed securities			4,194				3				1				4,196
Foreign government security			720				-				-				720
Municipal securities			330				2				-				332
		$	48,908			$	43			$	19			$	48,932

		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]

		March 29, 2025								December 28, 2024
		Amortized				Estimated				Amortized				Estimated
		Cost				Fair Value				Cost				Fair Value
Due in one year or less		$	36,176			$	36,193			$	47,819			$	47,855
Due after one year through five years			12,732				12,739				7,847				7,830
		$	48,908			$	48,932			$	55,666			$	55,685

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

		Fair value measurements at March 29, 2025 using:
														Total Estimated
		Level 1				Level 2				Level 3				Fair Value
Cash		$	113,202			$	-			$	-			$	113,202
Money market funds			-				37,308				-				37,308
Corporate debt securities			-				30,807				-				30,807
Bank certificates of deposit			-				9,514				-				9,514
U.S. treasury securities			-				4,729				-				4,729
Asset-backed securities			-				4,196				-				4,196
Foreign government security			-				720				-				720
Municipal securities			-				332				-				332
		$	113,202			$	87,606			$	-			$	200,808

		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