Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurement - Fair Value and Carrying Value of Long-term Debt (Details)

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Fair Value Measurement - Fair Value and Carrying Value of Long-term Debt (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Fair Value Disclosures [Abstract]    
Long-term debt value, fair value $ 66,819,949 $ 81,363,626
Long-term debt value, carrying value $ 71,724,665 $ 79,497,563