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Inventories
9 Months Ended
Sep. 30, 2012
Inventories [Abstract]  
Inventories
4. 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  
   

 

 

   

 

 

 

Amounts (debited) credited to the allowance for obsolete inventory and charged to cost of sales amounted to $65,000 and $47,000 for the three month periods ended September 30, 2012 and 2011, respectively, and $147,000 and $196,000 for the nine month periods ended September 30, 2012 and 2011, respectively.