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Other Intangible Assets (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Intangible Assets        
Gross amount $ 2,987,000 $ 2,987,000    
Accumulated amortization (2,351,000) (2,034,000)    
Net balance $ 636,000 953,000    
Amortization expense related to intangible assets   318,000 $ 393,000 $ 478,000
Future amortization        
2016   318,000    
2017   318,000    
Total   636,000    
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 (387,000) (325,000)    
Net balance $ 125,000 187,000    
Customer list        
Other Intangible Assets        
Estimated useful life 5 years      
Gross amount $ 2,046,000 2,046,000    
Accumulated amortization (1,535,000) (1,280,000)    
Net balance $ 511,000 $ 766,000