CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2024	Dec. 29, 2023	Dec. 30, 2022
Cash flows from operating activities:
Net Income (Loss)	$ (20,208)	$ 21,347	$ 39,665
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation of property, plant, and equipment	6,891	5,111	4,481
Amortization of intangibles		13	28
Impairment of intangibles		154
Accretion/amortization of investments available for sale	(1,091)	(2,501)	(1,198)
Deferred income taxes	3,590	3,264	(2,254)
Change in net pension liability	26	(956)	53
Loss on disposal of property and equipment	1,694	73	65
Stock-based compensation expense	27,210	23,516	20,371
Change in asset retirement obligation	(53)	(102)	47
Provision for sales returns and credit losses	286	663	913
Inventory provision	2,782	4,851	2,423
Changes in working capital:
Accounts receivable	16,493	(32,760)	(19,601)
Inventories	(10,000)	(14,361)	(7,943)
Prepayments, deposits, and other assets	(15,363)	(3,413)	(2,549)
Accounts payable	75	(701)	1,805
Other current liabilities	3,393	10,396	(591)
Net cash provided by operating activities	15,725	14,594	35,715
Cash flows from investing activities:
Acquisition of property and equipment	(23,394)	(18,188)	(18,108)
Purchase of investments available for sale	(80,240)	(52,313)	(155,748)
Proceeds from maturity of investments available for sale	43,103	143,548	17,121
Proceeds from sale of investments available for sale	1,314	1,300	359
Net cash provided by (used in) investing activities	(59,217)	74,347	(156,376)
Cash flows from financing activities:
Repayment of finance lease obligations	(165)	(161)	(126)
Repurchase of employee common stock for taxes withheld	(1,505)	(2,097)
Proceeds from the exercise of stock options	7,392	9,672	8,422
Proceeds from vested restricted stock	2	1	1
Net cash provided by financing activities	5,724	7,415	8,297
Effect of exchange rate changes on cash and cash equivalents	(1,111)	202	(862)
Increase (decrease) in cash and cash equivalents	(38,879)	96,558	(113,226)
Cash and cash equivalents, at beginning of year	183,038	86,480	199,706
Cash and cash equivalents, at end of year	$ 144,159	$ 183,038	$ 86,480