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Goodwill and Intangible Assets (Details 1) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Intangible assets - finite life    
Cost $ 4,157 $ 3,067
Accum. Amort. 2,874 2,541
Patents [Member]
   
Intangible assets - finite life    
Cost 1,414 1,414
Accum. Amort. 1,281 1,193
Employment Agreements [Member]
   
Intangible assets - finite life    
Cost 170 0
Accum. Amort. 0 0
Technology [Member]
   
Intangible assets - finite life    
Cost 230 0
Accum. Amort. 0 0
Customer lists [Member]
   
Intangible assets - finite life    
Cost 2,343 1,653
Accum. Amort. $ 1,593 $ 1,348