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Inventories (Tables)
6 Months Ended
Jun. 30, 2012
Inventories [Abstract]  
Summary of inventories
                 
(dollars in thousands)   June 30,
2012
    December 31,
2011
 

Raw materials and subassemblies

  $ 3,017     $ 3,017  

Finished goods

    1,176       1,147  

Parts for resale

    704       580  

Obsolescence allowance

    (407     (400
   

 

 

   

 

 

 
    $ 4,490     $ 4,344