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Commitments and contingencies (Details) (USD $)	Dec. 31, 2013
Other Commitments [Line Items]
2014	$ 137,208,540
2015	192,171,017
2016	42,336
Vessels Under Construction [Member]
Other Commitments [Line Items]
2014	120,592,620
2015	192,069,410
2016	0
Vessels (Acquired) Deliveries [Member]
Other Commitments [Line Items]
2014	16,480,000
2015	0
2016	0
Loan Commitment Fees [Member]
Other Commitments [Line Items]
2014	34,313
2015	0
2016	0
Office Space [Member]
Other Commitments [Line Items]
2014	101,607
2015	101,607
2016	$ 42,336

X

- Definition

Amount of contractual obligation maturing in the next fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of contractual obligation maturing in the second fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of contractual obligation maturing in the third fiscal year following the latest fiscal year.

+ References

No definition available.

+ Details

Name:	us-gaap_ContractualObligationDueInThirdYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration