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Derivative Instruments and Fair Value Measurements (Details 3) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Assets:
Investment	$ 197,509	$ 988,196
Bunker swaps	0	142,750
Bunker derivative instruments	0	0
Liabilities:
Interest rate swaps	0	0
Bunker swaps	0	53,000
Bunker derivative instruments	0	0
Fair Value, Inputs, Level 2 [Member]
Assets:
Investment	0	0
Bunker swaps	0	0
Bunker derivative instruments	0	261,000
Liabilities:
Interest rate swaps	2,243,833	9,486,116
Bunker swaps	0	0
Bunker derivative instruments	0	104,640
Fair Value, Inputs, Level 3 [Member]
Assets:
Investment	0	0
Bunker swaps	0	0
Bunker derivative instruments	0	0
Liabilities:
Interest rate swaps	0	0
Bunker swaps	0	0
Bunker derivative instruments	$ 0	$ 0

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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