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Allowance for Doubtful Accounts (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2012
Continuing operations
Allowance for Doubtful Accounts      
Balance in allowance for doubtful accounts $ 115,000 $ 132,000  
Bad debt expense     $ 17,000