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Debt (Details) - USD ($)
Dec. 11, 2015
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Secured long-term debt, gross   $ 131,707,822 $ 151,140,681
Less: current portion   (18,002,784) (19,499,262)
Less: unamortized debt issuance and bank fees   (1,677,921) (2,145,266)
Secured long-term debt   112,027,117 129,496,153
Bulk Pangaea Secured Note [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   1,040,625 1,734,375
Bulk Patriot Secured Note [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   1,087,500 2,312,500
Bulk Trident Secured Note [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   5,737,500 6,375,000
Bulk Juliana Secured Note [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   3,042,188 3,718,229
Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Loan Agreement [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   79,200,000 89,625,000
Bulk Atlantic Secured Note [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   5,645,000 6,530,000
Bulk Phoenix Secured Note [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   6,816,663 7,649,997
Nordic Bulk Barents Ltd. and Nordic Bulk Bothnia Ltd. [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   7,423,910 10,717,370
109 Long Wharf Commercial Term Loan [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   1,059,466 0
Long Wharf Construction to Term Loan [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   0 978,210
mv Nordic Bulk Oasis [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   20,375,000 21,500,000
mv Nordic Bulk Oasis [Member] | Primary Beneficiary      
Debt Instrument [Line Items]      
Ownership Percentage 33.33%    
mv Nordic Bulk Oasis [Member] | Not Primary Beneficiary | ST Shipping and Transport Ltd. (STST) [Member]      
Debt Instrument [Line Items]      
Ownership Percentage 33.33%    
mv Nordic Bulk Oasis [Member] | Not Primary Beneficiary | ASO 2020 Maritime S.A. (ASO2020) [Member]      
Debt Instrument [Line Items]      
Ownership Percentage 33.33%    
PBC US LLC Automobile Loan [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   29,435 0
PBC US LLC Master Loan [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   $ 250,535 $ 0