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Inventories (Tables)
9 Months Ended
Sep. 30, 2012
Inventories [Abstract]  
Summary of inventories
                 
(dollars in thousands)   September 30,
2012
    December 31,
2011
 

Raw materials and subassemblies

  $ 2,855     $ 3,017  

Finished goods

    1,207       1,147  

Parts for resale

    702       580  

Obsolescence allowance

    (472     (400
   

 

 

   

 

 

 
    $ 4,292     $ 4,344