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

3 Months Ended

Mar. 28, 2026

Notes Tables

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

		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

Investments Classified by Contractual Maturity Date [Table Text Block]

		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

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

		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