Other Intangible Assets (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Other Intangible Assets
Gross amount	$ 2,987,000		$ 2,987,000
Accumulated amortization	(2,113,000)		(2,034,000)
Net balance	874,000		953,000
Amortization expense related to intangible assets	79,000us-gaap_AmortizationOfIntangibleAssets	119,000us-gaap_AmortizationOfIntangibleAssets
Future amortization
2015	238,000
2016	318,000
2017	318,000
Total	874,000us-gaap_FiniteLivedIntangibleAssetsNet
Patents
Other Intangible Assets
Estimated useful life	14 years
Gross amount	429,000		429,000
Accumulated amortization	(429,000)		(429,000)
Non-compete
Other Intangible Assets
Estimated useful life	5 years
Gross amount	512,000		512,000
Accumulated amortization	(340,000)		(325,000)
Net balance	172,000		187,000
Customer list
Other Intangible Assets
Estimated useful life	5 years
Gross amount	2,046,000		2,046,000
Accumulated amortization	(1,344,000)		(1,280,000)
Net balance	$ 702,000		$ 766,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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