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Notes Payable (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Summary of notes payable    
Notes payable $ 1,702 $ 2,788
RDSI [Member]
    
Summary of notes payable    
Notes payable 952 1,288
First Tennessee Bank [Member]
    
Summary of notes payable    
Notes payable $ 750 $ 1,500