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Interest expense and finance costs (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest Expense And Finance Costs [Line Items]
Interest incurred	$ 4,303,181	$ 3,833,148
Amortization of deferred financing charges	607,740	600,463
Interest expense and finance costs	$ 4,910,921	$ 4,433,611

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- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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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
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Amount of the cost of borrowed funds accounted for as interest expense.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
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