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

9 Months Ended

Sep. 27, 2025

Notes Tables

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

		September 27, 2025
						Gross				Gross				Estimated
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses (1)				Value
Corporate debt securities (2)		$	21,716			$	21			$	2			$	21,735
Bank certificates of deposit			12,870				9				-				12,879
U.S. treasury securities			9,645				30				2				9,673
Asset-backed securities			2,880				5				-				2,885
Foreign government security			711				-				-				711
Municipal securities			330				-				-				330
		$	48,152			$	65			$	4			$	48,213

		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]

		September 27, 2025								December 28, 2024
		Amortized				Estimated				Amortized				Estimated
		Cost				Fair Value				Cost				Fair Value
Due in one year or less		$	35,515			$	35,537			$	47,819			$	47,855
Due after one year through five years			12,637				12,676				7,847				7,830
		$	48,152			$	48,213			$	55,666			$	55,685

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

		Fair value measurements at September 27, 2025 using:
														Total Estimated
		Level 1				Level 2				Level 3				Fair Value
Cash		$	109,799			$	-			$	-			$	109,799
Money market funds			-				36,788				-				36,788
Corporate debt securities			-				25,092				-				25,092
Bank certificates of deposit			-				12,879				-				12,879
U.S. treasury securities			-				9,673				-				9,673
Asset-backed securities			-				2,885				-				2,885
Foreign government security			-				711				-				711
Municipal securities			-				330				-				330
		$	109,799			$	88,358			$	-			$	198,157

		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

X

- Definition

Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

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X

- Definition

Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.

+ References

No definition available.

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- References

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- Definition

Tabular disclosure of unrealized gains and losses on investments.

+ References

No definition available.

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