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Debt (Details) (USD $) | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended | 4 Months Ended | 34 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 LoanTypes Subsidiary | Dec. 31, 2012 Vessel | Jun. 30, 2011 | Dec. 31, 2013 Maximum [Member] | Dec. 31, 2013 Minimum [Member] | Dec. 31, 2013 Facility I [Member] Subsidiary Tranche | Dec. 31, 2011 Facility I [Member] | Jun. 30, 2011 Facility I [Member] | Dec. 31, 2013 Facility II [Member] Tranche Vessel Subsidiary | Dec. 31, 2013 Facility III [Member] Subsidiary | Aug. 31, 2013 Revolving Credit Facility [Member] | Apr. 30, 2013 Revolving Credit Facility [Member] | Sep. 06, 2011 Revolving Credit Facility [Member] | Jul. 15, 2010 Revolving Credit Facility [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit facility |  |  |  |  |  | $ 40,500,000 |  |  | $ 48,900,000 | $ 81,850,000 |  |  | $ 50,000,000 | $ 30,000,000
Variable rate basis |  |  |  |  |  | LIBOR |  |  | LIBOR | LIBOR | LIBOR | LIBOR |  |
Basis spread on variable rate (in hundredths) |  |  |  |  |  | 3.25% |  |  | 3.20% | 3.75% | 4.00% | 5.00% |  |
Summary of Long-Term Debt [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 88,860,000 |  |  |  |  | 9,000,000 |  |  | 46,830,000 | 33,030,000 |  |  |  |
Current portion of long-term debt | 9,100,000 | 6,819,918 |  |  |  |  |  |  |  |  |  |  |  |
Non-current portion of long-term debt | 79,760,000 | 60,280,082 |  |  |  |  |  |  |  |  |  |  |  |
Future minimum repayments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
2014 | 9,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2015 | 9,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2016 | 9,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2017 | 9,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2018 | 38,530,000 |  |  |  |  |  |  |  |  |  |  |  |  |
2019 | 13,930,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 88,860,000 |  |  |  |  | 9,000,000 |  |  | 46,830,000 | 33,030,000 |  |  |  |
Number of loan facilities | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of subsidiaries entered into a long term loan facility agreement |  |  |  |  |  | 3 |  |  | 2 | 5 |  |  |  |
Number of tranches |  |  |  |  |  | 3 |  |  | 6 |  |  |  |  |
Amount drawn down from loan facility |  |  | 32,400,000 |  |  |  |  | 32,000,000 |  | 36,850,000 |  |  |  |
Remaining amount no longer available for borrowing |  |  |  |  |  | 8,500,000 |  |  |  |  |  |  |  |
Number of subsidiaries entered into capital lease arrangement | 2 |  |  |  |  | 2 |  |  |  |  |  |  |  |
Senior debt outstanding repaid | 17,900,000 |  |  |  |  | 17,900,000 |  |  |  |  |  |  |  |
Number of subsidiary remains with debt outstanding |  |  |  |  |  | 1 |  |  |  |  |  |  |  |
Maturity date |  |  |  |  |  | Dec. 31, 2018 | Dec. 31, 2016 |  | Dec. 31, 2018 | Dec. 31, 2019 |  |  |  |
Number of vessels under construction |  | 12 |  |  |  |  |  |  | 2 |  |  |  |  |
Remaining borrowing capacity |  |  |  |  |  |  |  |  |  | 45,000,000 |  |  |  |
Long term debt financial covenants [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Required minimum cash balance | 4,800,000 | 3,600,000 |  |  |  |  |  |  |  |  |  |  |  |
Required value maintenance covenant (in hundredths) |  |  |  | 135.00% | 125.00% |  |  |  |  |  |  |  |  |
Required value maintenance covenant for twelve years old vessel (in hundredths) |  |  |  | 150.00% | 135.00% |  |  |  |  |  |  |  |  |
Minimum net worth required | $ 45,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |

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