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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
Name: | us-gaap_ContractualObligationDueInNextTwelveMonths
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
Name: | us-gaap_ContractualObligationDueInSecondYear
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
Name: | us-gaap_OtherCommitmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration