CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 25, 2010
Cash flows from operating activities:
Net income (loss)	$ (12,243)	$ 15,719	$ 24,644
Adjustments to reconcile net income (loss) to net cash provided from operating activities:
Depreciation and amortization	9,403	10,067	10,988
Share-based compensation expense	4,621	4,287	3,543
Gain on sale of facility	(677)
Deferred income taxes	581	(1,676)	(1,971)
Accrued retiree benefits	(91)	381	(222)
Excess tax benefit from stock options exercised		(2)	(234)
Changes in current assets and liabilities, excluding effects from acquisitions:
Accounts receivable	4,979	24,877	(23,434)
Inventories	19,897	(20,865)	(13,866)
Accounts payable	(5,458)	427	(4,402)
Other current assets	978	(1,549)	2,958
Income taxes payable, including excess stock option exercise benefits	(1,667)	(6,462)	7,334
Deferred profit	(682)	(12,013)	9,512
Accrued compensation, warranty and other liabilities	(6,472)	(953)	4,665
Net cash provided from operating activities	13,169	12,238	19,515
Cash flows from investing activities, excluding effects from acquisitions:
Sales and maturities of short-term investments	84,780	75,657	46,979
Purchases of short-term investments	(40,461)	(75,128)	(52,491)
Purchases of property, plant and equipment	(3,267)	(1,413)	(4,579)
Cash received from facility sale	1,080
Cash paid for Duma Video, Inc.	(900)
Other assets	(66)	78	314
Net cash provided from (used for) investing activities	41,166	(806)	(9,777)
Cash flows from financing activities:
Cash dividends paid	(7,333)	(5,777)	(5,679)
Issuance of stock, net	1,570	1,911	3,617
Excess tax benefit from stock options exercised		2	234
Net cash used for financing activities	(5,763)	(3,864)	(1,828)
Effect of exchange rate changes on cash and cash equivalents	974	(227)	(236)
Net increase in cash and cash equivalents	49,546	7,341	7,674
Cash and cash equivalents at beginning of year	53,262	45,921	38,247
Cash and cash equivalents at end of year	102,808	53,262	45,921
Supplemental disclosure of cash flow information:
Income taxes	711	10,203	(2,138)
Inventory capitalized as capital assets	567	1,380	2,990
Dividends declared but not yet paid		$ 1,455	$ 1,434