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Other Intangible Assets (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Other Intangible Assets          
Gross amount $ 2,987,000   $ 2,987,000   $ 2,987,000
Accumulated amortization (2,193,000)   (2,193,000)   (2,034,000)
Net balance 794,000   794,000   953,000
Amortization expense related to intangible assets 79,000 $ 113,000 159,000 $ 232,000  
Future amortization          
2015 158,000   158,000    
2016 318,000   318,000    
2017 318,000   318,000    
Total 794,000   $ 794,000    
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 (356,000)   (356,000)   (325,000)
Net balance 156,000   $ 156,000   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 (1,408,000)   (1,408,000)   (1,280,000)
Net balance $ 638,000   $ 638,000   $ 766,000