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Accounts Receivable
 12 Months Ended
Dec. 31, 2012
Accounts Receivable [Abstract]  
Accounts Receivable
3. Accounts Receivable

 

                 
$ in thousands   2012     2011  

Trade receivables

   $ 3,893     $ 3,389  

Contract receivables

     26,171       20,274  

Allowance for doubtful accounts

     (565 )      (554 ) 
   

 

 

    

 

 

  
    $ 29,499     $ 23,109  
   

 

 

    

 

 

  

Balances billed, but not paid by customers under retainage provisions in contracts, amounted to approximately $351,000 and $504,000 at December 31, 2012 and 2011, respectively. Retainage receivables on contracts in progress are generally collected within a year after contract completion.

Provision for doubtful accounts was approximately $176,000 and $402,000 during 2012 and 2011, respectively, while accounts charged to the allowance were $165,000 and $269,000 during 2012 and 2011, respectively.