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Fair Value Measurements (Details) (Recurring, USD $)
Dec. 31, 2012
Sep. 30, 2012
Dec. 31, 2011
Fair Value
     
Available-for-sale securities $ 2,277,727 $ 2,271,721 $ 2,379,575
Quoted Prices In Active Markets for Identical Assets/Liabilities (Level 1)
     
Available-for-sale securities 2,277,727 2,271,721 2,379,575
Level 2
     
Available-for-sale securities 0 0 0
Level 3
     
Available-for-sale securities $ 0 $ 0 $ 0