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Other Intangible Assets (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Other Intangible Assets      
Gross amount $ 2,987,000   $ 2,987,000
Accumulated amortization (2,431,000)   (2,351,000)
Net balance 556,000   636,000
Amortization expense related to intangible assets 80,000 $ 79,000  
Future amortization      
2016 238,000    
2017 318,000    
Total $ 556,000    
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 (403,000)   (387,000)
Net balance $ 109,000   125,000
Customer list      
Other Intangible Assets      
Estimated useful life 5 years    
Gross amount $ 2,046,000   2,046,000
Accumulated amortization (1,599,000)   (1,535,000)
Net balance $ 447,000   $ 511,000