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Other Intangible Assets (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Other Intangible Assets          
Gross amount $ 2,987,000   $ 2,987,000   $ 2,987,000
Accumulated amortization (2,272,000)   (2,272,000)   (2,034,000)
Net balance 715,000   715,000   953,000
Amortization expense related to intangible assets 79,000 $ 81,000 238,000 $ 313,000  
Future amortization          
2015 79,000   79,000    
2016 318,000   318,000    
2017 318,000   318,000    
Total 715,000   $ 715,000    
Patents          
Other Intangible Assets          
Estimated useful life     14 years    
Gross amount 429,000   $ 429,000   429,000
Accumulated amortization (429,000)   $ (429,000)   (429,000)
Non-compete          
Other Intangible Assets          
Estimated useful life     5 years    
Gross amount 512,000   $ 512,000   512,000
Accumulated amortization (372,000)   (372,000)   (325,000)
Net balance 140,000   $ 140,000   187,000
Customer list          
Other Intangible Assets          
Estimated useful life     5 years    
Gross amount 2,046,000   $ 2,046,000   2,046,000
Accumulated amortization (1,471,000)   (1,471,000)   (1,280,000)
Net balance $ 575,000   $ 575,000   $ 766,000