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Interest expense and finance costs (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2011
Interest expense and finance costs [Abstract]
Interest incurred	$ 5,063,418	$ 3,248,789	$ 3,333,941
Capitalized interest	(2,372,199)	(537,322)	(543,860)
Amortization of deferred finance charges	772,787	254,547	290,391
Interest expense and finance costs	3,464,006	2,966,014	3,080,472
Amount drawn down from loan facility				$ 32,400,000

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

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-Section S99

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Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount borrowed under the credit facility as of the balance sheet date.

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