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Medium-Term Investments (Details) (USD $)
1 Months Ended
Jan. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2010
Medium-Term Investments (Textuals)    
Medium-term investments principal balance $ 0$ 5,531,000$ 5,531,000
Medium term investment reclassified to cash equivalents  3,630,000 
Medium-term investments 003,910,000[1]
Redemption of medium-term investments$ 3,630,000   
[1]As Restated, See Note 1