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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2011
Summary of Significant Accounting Policies (Tables) [Abstract]  
Fair value of assets and liabilities on recurring basis
                                 
    Fair Value Measurements at Reporting  
    Date Using:  
            Quoted Prices in              
            Active Markets for     Significant Other     Unobservable  
    June 30,     Identical Assets     Observable Inputs     Inputs  
Description   2011     (Level 1)     (Level 2)     (Level 3)  
 
                               
Recurring
                               
Assets:
                               
Available-for-Sale Securities
  $ 284     $ 284     $     $  
                                 
    Fair Value Measurements at Reporting  
    Date Using:  
            Quoted Prices in              
            Active Markets for     Significant Other     Unobservable  
    December 31,     Identical Assets     Observable Inputs     Inputs  
Description   2010     (Level 1)     (Level 2)     (Level 3)  
 
Recurring
                               
Assets:
                               
Available-for-Sale Securities
  $ 248     $ 248     $     $