Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 30,693	$ 45,206
Available-for-sale securities	51,390us-gaap_MarketableSecuritiesCurrent	26,984us-gaap_MarketableSecuritiesCurrent
Trade receivables, net of allowances of $36 and $108	16,816us-gaap_AccountsReceivableNetCurrent	26,260us-gaap_AccountsReceivableNetCurrent
Inventories	19,966us-gaap_InventoryNet	24,896us-gaap_InventoryNet
Prepaids and other current assets	5,342	6,987
Income taxes receivable	22us-gaap_IncomeTaxesReceivable	50us-gaap_IncomeTaxesReceivable
Deferred income tax assets	11,030us-gaap_DeferredTaxAssetsNetCurrent	12,368us-gaap_DeferredTaxAssetsNetCurrent
Total current assets	135,259us-gaap_AssetsCurrent	142,751us-gaap_AssetsCurrent
Property, plant and equipment, net	9,665us-gaap_PropertyPlantAndEquipmentNet	9,634us-gaap_PropertyPlantAndEquipmentNet
Goodwill	2,318us-gaap_Goodwill	2,520us-gaap_Goodwill
Other intangible assets, net	10,285	10,575
Long-term deferred income tax assets	4,797	9,546
Other assets	533us-gaap_OtherAssets	628us-gaap_OtherAssets
Total assets	162,857us-gaap_Assets	175,654us-gaap_Assets
Liabilities and Shareholders' Equity
Trade payables	26,829us-gaap_AccountsPayableCurrent	47,574us-gaap_AccountsPayableCurrent
Accrued liabilities	9,140us-gaap_AccruedLiabilitiesCurrent	9,851us-gaap_AccruedLiabilitiesCurrent
Warranty obligations, current portion	2,497	2,246
Total current liabilities	38,466us-gaap_LiabilitiesCurrent	59,671us-gaap_LiabilitiesCurrent
Income taxes payable, non-current	3,828us-gaap_AccruedIncomeTaxesNoncurrent	3,725us-gaap_AccruedIncomeTaxesNoncurrent
Other long-term liabilities	1,186us-gaap_OtherLiabilitiesNoncurrent	1,186us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	43,480us-gaap_Liabilities	64,582us-gaap_Liabilities
Commitments and contingencies (Note 13)
Shareholders' equity:
Common stock - no par value, 75,000 shares authorized, 31,382 and 31,333 shares issued and outstanding	6,091us-gaap_CommonStockValue	8,033us-gaap_CommonStockValue
Retained earnings	114,079	103,347
Accumulated other comprehensive loss	(793)	(308)
Total shareholders' equity	119,377us-gaap_StockholdersEquity	111,072us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	$ 162,857	$ 175,654

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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