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

9 Months Ended

Sep. 28, 2024

Notes Tables

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

		September 28, 2024
						Gross				Gross				Estimated
		Amortized				Unrealized				Unrealized				Fair
		Cost				Gains				Losses (1)				Value
Corporate debt securities (2)		$	50,457			$	171			$	2			$	50,626
U.S. treasury securities			16,827				47				1				16,873
Bank certificates of deposit			8,562				12				-				8,574
Asset-backed securities			2,827				10				-				2,837
Foreign government security			732				-				-				732
Municipal securities			330				4				-				334
		$	79,735			$	244			$	3			$	79,976

		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]

		September 28, 2024								December 30, 2023
		Amortized				Estimated				Amortized				Estimated
		Cost				Fair Value				Cost				Fair Value
Due in one year or less		$	66,546			$	66,708			$	57,981			$	57,887
Due after one year through five years			13,189				13,268				31,378				31,546
Due after five years through ten years			-				-				741				741
		$	79,735			$	79,976			$	90,100			$	90,174

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

		Fair value measurements at September 28, 2024 using:
														Total Estimated
		Level 1				Level 2				Level 3				Fair Value
Cash		$	135,158			$	-			$	-			$	135,158
Corporate debt securities			-				70,113				-				70,113
Money market funds			-				34,197				-				34,197
U.S. treasury securities			-				16,873				-				16,873
Bank certificates of deposit			-				8,994				-				8,994
Asset-backed securities			-				2,837				-				2,837
Foreign government security			-				732				-				732
Municipal securities			-				334				-				334
		$	135,158			$	134,080			$	-			$	269,238

		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

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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X

- References

No definition available.

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- Definition

Tabular disclosure of unrealized gains and losses on investments.

+ References

No definition available.

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