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Business segment information (Details 4) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Property, plant and equipment by geographic area    
Property, plant and equipment, net $ 52,124 $ 45,535
U.S.
   
Property, plant and equipment by geographic area    
Property, plant and equipment, net 39,563 32,718
Italy
   
Property, plant and equipment by geographic area    
Property, plant and equipment, net 7,663 7,614
U.K.
   
Property, plant and equipment by geographic area    
Property, plant and equipment, net 1,449 1,618
Brazil
   
Property, plant and equipment by geographic area    
Property, plant and equipment, net 2,532 2,400
Others
   
Property, plant and equipment by geographic area    
Property, plant and equipment, net $ 917 $ 1,185