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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