Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Fair Value Measurement - Fair Value and Carrying Value of Long-term Debt (Details) (USD $)
Jun. 30, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]    
Long-term debt value, fair value $ 62,357,971 $ 66,817,614
Long-term debt value, carrying value $ 64,447,318 $ 70,539,703