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Debt (Details) - USD ($)
Dec. 11, 2015
Sep. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Secured long-term debt, gross   $ 133,158,548 $ 128,794,208
Less: current portion   (17,830,996) (19,627,846)
Less: unamortized debt issuance and bank fees   (1,897,347) (1,528,511)
Secured long-term debt   113,430,205 107,637,851
Bulk Nordic Six Ltd. Loan Agreement [Domain]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   19,135,000 0
Bulk Freedom Loan Agreement [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   5,325,000 0
Bulk Pangaea Secured Note [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   0 1,040,625
Bulk Patriot Secured Note [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   0 1,087,500
Bulk Trident Secured Note [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   3,887,500 5,737,500
Bulk Juliana Secured Note [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   2,028,126 3,042,186
Bulk Nordic Odin, Bulk Nordic Olympic, Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Loan Agreement [Member] [Domain]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   71,700,000 77,325,001
Bulk Atlantic Secured Note [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   0 5,350,000
Bulk Phoenix Secured Note [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   4,916,663 6,816,685
Nordic Bulk Barents Ltd. and Nordic Bulk Bothnia Ltd. [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   6,119,550 7,097,820
Bulk Nordic Oasis Ltd. Loan Agreement [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   18,875,000 20,000,000
Long Wharf Construction to Term Loan [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   949,864 1,032,067
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   24,483 28,582
PBC US LLC Master Loan [Member]      
Debt Instrument [Line Items]      
Secured long-term debt, gross   $ 197,362 $ 236,242