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 $)
Mar. 31, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]    
Long-term debt value, fair value $ 62,842,928 $ 66,817,614
Long-term debt value, carrying value $ 66,827,059 $ 70,539,703