Other Intangible Assets (Details) (USD $)	3 Months Ended	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Other Intangible Assets
Other Intangible Assets, Cost	$ 7,820,000	$ 7,820,000	$ 7,539,000
Other Intangible Assets, Accumulated Amortization	5,328,000	5,328,000	5,102,000
Other Intangible Assets, Net Book Value	2,492,000	2,492,000	2,437,000
Other Intangible Assets (Textuals) [Abstract]
Costs incurred to renew or extend the term of acquired other intangible assets	100,000	100,000
Patents and Trademarks [Member]
Other Intangible Assets
Other Intangible Assets, Cost	7,570,000	7,570,000	7,289,000
Other Intangible Assets, Accumulated Amortization	5,078,000	5,078,000	4,852,000
Other Intangible Assets, Net Book Value	2,492,000	2,492,000	2,437,000
Other Intangible Assets (Additional Textuals) [Abstract]
Acquisition of patents and Trademarks, cost	300,000	300,000
Acquisition of patents and Trademarks, net book value	300,000	300,000
Weighted average amortization period for additions to other intangible assets		10 years
Other Finite Lived Assets [Member]
Other Intangible Assets
Other Intangible Assets, Cost	250,000	250,000	250,000
Other Intangible Assets, Accumulated Amortization	250,000	250,000	250,000
Other Intangible Assets, Net Book Value	0	0	0
Other Intangible Assets (Additional Textuals) [Abstract]
Approximate amortization expense of other intangible assets for 2011		200,000
2012		300,000
2013		300,000
2014		300,000
2015		300,000
2016		$ 300,000