Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 27, 2014	Dec. 28, 2013	Dec. 29, 2012
Cash flows from operating activities:
Net income (loss)	$ 8,708us-gaap_NetIncomeLoss	$ (33,418)us-gaap_NetIncomeLoss	$ (12,243)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Gain on disposal of video camera segment	(4,434)
Impairment of goodwill and other assets (Note 3)	5,000
Operating cash flows of discontinued operations	(694)	2,316	1,686
Depreciation and amortization	13,528	13,328	9,215
Share-based compensation expense	6,585us-gaap_ShareBasedCompensation	5,346us-gaap_ShareBasedCompensation	4,499us-gaap_ShareBasedCompensation
Gain on sale of facility			(677)us-gaap_GainLossOnSaleOfProperties
Deferred income taxes	(487)us-gaap_DeferredIncomeTaxExpenseBenefit	(2,132)us-gaap_DeferredIncomeTaxExpenseBenefit	581us-gaap_DeferredIncomeTaxExpenseBenefit
Accrued retiree benefits	659	130	(91)
Changes in current assets and liabilities, excluding effects from acquisitions, divestitures and impairments:
Accounts receivable	(15,484)	(2,357)	3,215
Accrued compensation, warranty and other liabilities	6,121	(1,583)	(6,476)
Inventories	(1,850)us-gaap_IncreaseDecreaseInInventories	11,884us-gaap_IncreaseDecreaseInInventories	19,697us-gaap_IncreaseDecreaseInInventories
Deferred profit	1,379	3,833	(682)
Other current and non-current assets	(1,083)	(569)	945
Income taxes payable, including excess stock option exercise benefits	1,410	156	(1,662)
Accounts payable	320	6,483	(4,838)
Net cash provided by operating activities	19,678	3,417	13,169
Cash flows from investing activities, excluding effects from acquisitions, divestitures and impairments:
Cash received from sale of video camera segment, net	10,258
Sales and maturities of short-term investments	1,045	6,221	84,780
Purchases of short-term investments	(1,000)		(40,461)
Purchases of property, plant and equipment	(1,660)	(3,874)	(3,240)
Payment for purchase of Ismeca, net of cash received		(53,463)
Payment for purchase of Duma Video, Inc.			(900)
Cash received from facility sale			1,080us-gaap_ProceedsFromSaleOfBuildings
Other assets		(176)	(66)
Investing cash flows of discontinued operations	(6)	(34)	(27)
Net cash provided by (used in) investing activities	8,637	(51,326)	41,166
Cash flows from financing activities:
Cash dividends paid	(6,067)us-gaap_PaymentsOfDividendsCommonStock	(4,468)us-gaap_PaymentsOfDividendsCommonStock	(7,333)us-gaap_PaymentsOfDividendsCommonStock
Issuance of stock, net	1,891us-gaap_ProceedsFromRepurchaseOfEquity	1,316us-gaap_ProceedsFromRepurchaseOfEquity	1,570us-gaap_ProceedsFromRepurchaseOfEquity
Net cash used in financing activities	(4,176)	(3,152)	(5,763)
Effect of exchange rate changes on cash and cash equivalents	(4,922)	(79)	974
Net increase (decrease) in cash and cash equivalents	19,217	(51,140)	49,546
Cash and cash equivalents at beginning of year	51,668	102,808	53,262
Cash and cash equivalents at end of year	70,885	51,668	102,808
Supplemental disclosure of cash flow information:
Cash paid (refunded) during the year for income taxes	971us-gaap_IncomeTaxesPaidNet	(900)us-gaap_IncomeTaxesPaidNet	711us-gaap_IncomeTaxesPaidNet
Inventory capitalized as capital assets	1,301	657	567
Dividends declared but not yet paid	$ 1,539	$ 1,504

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period).

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The net cash inflow or outflow resulting from the entity's share transaction.

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The cash inflow from sale of buildings.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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