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Note 5 - Financial Instruments Measured at Fair Value

3 Months Ended

Mar. 28, 2026

Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block]

5.	Financial Instruments Measured at Fair Value

Our cash, cash equivalents, and short-term investments consisted primarily of cash and other investment grade securities. We do not hold investment securities for trading purposes. All short-term investments in debt securities are classified as available-for-sale and recorded at fair value. Investment securities are exposed to market risk due to changes in interest rates and credit risk and we monitor credit risk and attempt to mitigate exposure by making high-quality investments and through investment diversification.

We assess whether unrealized loss positions on available-for-sale debt securities are due to credit-related factors. The credit-related portion of unrealized losses, and any subsequent improvements, are recorded in earnings through an allowance account. Unrealized gains and losses that are not due to credit-related factors are included in accumulated other comprehensive loss. Factors that could indicate an impairment exists include, but are not limited to, earnings performance, changes in credit rating or adverse changes in the regulatory or economic environment of the asset. Gross realized gains and losses on sales of short-term investments are included in interest income. Realized gains and losses for the periods presented were not significant.

Investments that we have classified as short-term, by security type, are as follows (in thousands):

	March 28, 2026
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses ⁽¹⁾		Value
Corporate debt securities ⁽²⁾	$	147,366	$	21	$	206	$	147,181
Bank certificates of deposit		73,260		6		70		73,196
U.S. treasury securities		42,121		11		99		42,033
Asset-backed securities		14,689		2		23		14,668
Foreign government security		681		-		-		681
	$	278,117	$	40	$	398	$	277,759

	December 27, 2025
			Gross		Gross		Estimated
	Amortized		Unrealized		Unrealized		Fair
	Cost		Gains		Losses ⁽¹⁾		Value
Corporate debt securities ⁽²⁾	$	150,314	$	60	$	13	$	150,361
Bank certificates of deposit		58,130		26		-		58,156
U.S. treasury securities		37,584		68		-		37,652
Asset-backed securities		10,038		18		-		10,056
Foreign government security		703		-		-		703
	$	256,769	$	172	$	13	$	256,928


	(1)	As of March 28, 2026, the cost and fair value of investments with loss positions were approximately $211.0 million and $210.6 million, respectively. As of December 27, 2025, the cost and fair value of investments with loss positions were both approximately $58.3 million. We evaluated the nature of these investments, credit worthiness of the issuer and the duration of these impairments to determine if a credit-related decline in fair value had occurred and concluded that these losses were temporary and we have the ability and intent to hold these investments to maturity.

(2)

Corporate debt securities include investments in financial and other corporate institutions. No single issuer represents a significant portion of the total corporate debt securities portfolio.

Effective maturities of short-term investments are as follows (in thousands):

	March 28, 2026				December 27, 2025
	Amortized		Estimated		Amortized		Estimated
	Cost		Fair Value		Cost		Fair Value
Due in one year or less	$	210,886	$	210,740	$	200,379	$	200,436
Due after one year through five years		67,231		67,019		56,390		56,492
	$	278,117	$	277,759	$	256,769	$	256,928

Accounting standards pertaining to fair value measurements establish a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value. These tiers include: Level 1, defined as observable inputs such as quoted prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. When available, we use quoted market prices to determine the fair value of our investments, and they are included in Level 1. When quoted market prices are unobservable, we use quotes from independent pricing vendors based on recent trading activity and other relevant information, and they are included in Level 2.

The following table summarizes, by major security type, our financial instruments that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy (in thousands):

	Fair value measurements at March 28, 2026 using:
							Total Estimated
	Level 1		Level 2		Level 3		Fair Value
Cash	$	114,422	$	-	$	-	$	114,422
Corporate debt securities		-		153,664		-		153,664
Money market funds		-		90,036		-		90,036
Bank certificates of deposit		-		73,196		-		73,196
U.S. treasury securities		-		42,033		-		42,033
Asset-backed securities		-		14,668		-		14,668
Foreign government security		-		681		-		681
	$	114,422	$	374,278	$	-	$	488,700

	Fair value measurements at December 27, 2025 using:
							Total Estimated
	Level 1		Level 2		Level 3		Fair Value
Cash	$	142,091	$	-	$	-	$	142,091
Corporate debt securities		-		183,611		-		183,611
Bank certificates of deposit		-		58,156		-		58,156
Money market funds		-		51,712		-		51,712
U.S. treasury securities		-		37,652		-		37,652
Asset-backed securities		-		10,056		-		10,056
Foreign government security		-		703		-		703
	$	142,091	$	341,890	$	-	$	483,981