Balance Sheet Components (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 29, 2025	Jun. 30, 2024	Jun. 29, 2025	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Balance Sheet Related Disclosures [Line Items]
Accrued interest receivable	$ 1,400,000		$ 1,400,000
Unrealized Losses	0		0		$ 0
Unrealized losses on available-for-sale securities	0	$ 0	0	$ 0
Other-than-temporary impairments	0	0	0	0
Provisions for excess and obsolete inventory	800,000	1,900,000	2,179,000	2,954,000
Equity securities without readily determinable fair value, cumulative downward adjustments for price change and impairment loss	0		0
Cumulative upward adjustments for price changes	300,000		300,000
Carrying value of equity investments without readily determinable fair values	6,100,000	6,100,000	6,100,000	6,100,000
Equity investments	8,699,000		8,699,000		8,381,000
Limited Partnership Fund
Balance Sheet Related Disclosures [Line Items]
Equity investments	$ 2,600,000	$ 2,300,000	$ 2,600,000	$ 2,300,000	$ 2,300,000	$ 2,300,000