Derivative Instruments and Fair Value Measurements (Details Textual) (USD $)			12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Interest Rate Swap [Member]
Fair value of derivative instruments	$ 2,243,833	$ 9,486,116
Interest Swaps			Company will pay fixed rate interest and receive floating-rate interest amounts based on three-month LIBOR settings

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, and which are expected to be extinguished or otherwise disposed of after one year or beyond the normal operating cycle, if longer, net of the effects of master netting arrangements.

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+ Details