CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 27, 2022	Mar. 28, 2021
Cash flows from operating activities:
Net (loss) income	$ (1,538)	$ 3,480
Adjustments to reconcile net (loss) income to net cash (used in) provided by operating activities:
Depreciation and amortization	948	785
Amortization of right-of-use assets	413
Amortization of available-for-sale debt securities	321	405
Stock-based compensation expense	1,296	853
Deferred Taxes	(2,572)	142
Other	199	(508)
Changes in operating assets and liabilities:
Accounts receivable	1,080	2,717
Inventories	(2,363)	1,636
Prepaid expenses and other current assets	538	1,492
Deposits and other assets	(49)
Income taxes payable	(112)	(449)
Accounts payable	(2,973)	(1,402)
Accrued liabilities	240	(1,111)
Operating lease liabilities	(367)
Net cash (used in) provided by operating activities	(4,939)	8,040
Cash flows from investing activities:
Purchases of property, plant and equipment	(1,686)	(3,451)
Purchases of available-for-sale debt securities	(13,973)	(14,409)
Sales of available-for sale debt securities		1,441
Maturities and call redemptions of available-for-sale debt securities	14,254	13,569
Proceeds from the sale of property, plant and equipment	50
Net cash used in investing activities	(1,355)	(2,850)
Cash flows from financing activities:
Payment of contingent consideration	(26)	(42)
Principal payments under finance lease obligations	(126)	(116)
Proceeds from exercise of stock options	254	525
Net cash provided by financing activities	102	367
Net (decrease) increase in cash and cash equivalents	(6,192)	5,557
Cash and cash equivalents at beginning of the period	30,966	29,544
Cash and cash equivalents at end of the period	24,774	35,101
Supplemental disclosure of cash flow information:
Cash paid for interest	8	20
Cash paid for income taxes	7
Supplemental disclosure of non-cash investing and financing activities:
Purchases of property, plant and equipment included in accounts payable and accrued liabilities	$ 2,147	$ 140