Intangible Assets (Schedule Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,050	$ 3,033
Accumulated Amortization	(2,435)	(2,391)
Net	615us-gaap_FiniteLivedIntangibleAssetsNet	642us-gaap_FiniteLivedIntangibleAssetsNet
Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,642	2,625
Accumulated Amortization	(2,366)	(2,338)
Net	276	287
Software [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	206	206
Accumulated Amortization	(30)	(23)
Net	176	183
Marketing Assets/Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	101	101
Accumulated Amortization	(13)	(10)
Net	88	91
Non-compete agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	101	101
Accumulated Amortization	(26)	(20)
Net	$ 75	$ 81

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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