Debt - Additional Information (Details)												9 Months Ended
	May 13, 2019 USD ($) quarter installment	Dec. 21, 2017 USD ($) installment	Jun. 14, 2017 USD ($) installment	Apr. 27, 2017	Mar. 31, 2017	Jan. 07, 2017 USD ($) tranche installment	May 27, 2016 USD ($) installment	Dec. 11, 2015 USD ($) installment	Sep. 28, 2015 USD ($) installment	Mar. 07, 2014 USD ($) tranche installment	May 31, 2013 USD ($) installment	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 31, 2017
Debt Instrument [Line Items]
Interest Payable, Current												$ 460,758	$ 540,886
Secured Debt | Bulk Phoenix Secured Note
Debt Instrument [Line Items]
Face amount											$ 10,000,000
Periodic payment terms, balloon payment to be paid											$ 1,816,659
Interest rate, stated percentage											5.09%
Secured Debt | Bulk Phoenix Secured Note | Seven equal quarterly installments
Debt Instrument [Line Items]
Number of periodic payments | installment											7
Periodic payment, principal amount											$ 442,858
Secured Debt | Bulk Phoenix Secured Note | Two quarterly installment
Debt Instrument [Line Items]
Number of periodic payments | installment											2
Periodic payment, principal amount											$ 700,000
Secured Debt | Bulk Nordic Oasis Ltd. Loan Agreement
Debt Instrument [Line Items]
Face amount								$ 21,500,000
Periodic payment, principal amount								375,000
Periodic payment terms, balloon payment to be paid								$ 12,500,000
Interest rate, stated percentage								4.30%
Secured Debt | Bulk Nordic Oasis
Debt Instrument [Line Items]
Number of periodic payments | installment								24
Secured Debt | Term Loan Facility of USD 13,000,000 (Nordic Bulk Barents Ltd. and Nordic Bulk Bothnia Ltd.)
Debt Instrument [Line Items]
Face amount										$ 13,000,000		$ 13,000,000
Periodic payment terms, balloon payment to be paid										$ 1,755,415
Number of tranches | tranche										2
Secured Debt | Term Loan Facility of USD 13,000,000 (Nordic Bulk Barents Ltd. and Nordic Bulk Bothnia Ltd.) | Twenty-two equal quarterly installments
Debt Instrument [Line Items]
Number of periodic payments | installment										22
Periodic payment, principal amount										$ 163,045
Secured Debt | Term Loan Facility of USD 13,000,000 (Nordic Bulk Barents Ltd. and Nordic Bulk Bothnia Ltd.) | One Installment Per Borrower
Debt Instrument [Line Items]
Periodic payment, principal amount										163,010
Secured Debt | Nordic Bulk Bothina Ltd.
Debt Instrument [Line Items]
Long-term line of credit										$ 6,500,000
Secured Debt | Bulk Freedom Loan Agreement
Debt Instrument [Line Items]
Face amount			$ 5,500,000
Periodic payment terms, balloon payment to be paid			$ 2,300,000
Basis spread on variable rate			3.75%									5.78%
Secured Debt | Bulk Freedom Loan Agreement | Twelve equal quarterly installments
Debt Instrument [Line Items]
Number of periodic payments | installment			12
Periodic payment, principal amount			$ 150,000
Secured Debt | Bulk Freedom Loan Agreement | Eight equal quarterly installments
Debt Instrument [Line Items]
Number of periodic payments | installment			8
Periodic payment, principal amount			$ 175,000
Secured Debt | Bulk Endurance Senior Tranche Loan
Debt Instrument [Line Items]
Face amount						$ 16,000,000
Secured Debt | 109 Long Wharf Commercial Term Loan
Debt Instrument [Line Items]
Face amount							$ 1,096,000
Number of periodic payments | installment							120
Periodic payment, principal amount							$ 9,133
Basis spread on variable rate							2.00%
Interest rate, effective percentage												4.14%
m/v Nordic Odin | Secured Debt
Debt Instrument [Line Items]
Face amount									$ 21,750,000
m/v Nordic Odin | Secured Debt | Bulk Nordic Odin, Bulk Nordic Olympic, Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Loan Agreement
Debt Instrument [Line Items]
Number of periodic payments | installment									28
Periodic payment, principal amount									$ 375,000
Periodic payment terms, balloon payment to be paid									11,233,150
Interest rate, stated percentage				4.07%										3.95%
Interest rate, portion fixed														50.00%
m/v Nordic Odin | Secured Debt | Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Debt Agreement
Debt Instrument [Line Items]
Basis spread on variable rate				2.00%
Odyssey And Orion | Secured Debt
Debt Instrument [Line Items]
Face amount									$ 13,500,000
Odyssey And Orion | Secured Debt | Bulk Nordic Odin, Bulk Nordic Olympic, Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Loan Agreement
Debt Instrument [Line Items]
Number of periodic payments | installment									20
Periodic payment, principal amount									$ 5,677,203
Periodic payment terms, balloon payment to be paid									375,000
Interest rate, stated percentage					4.24%
Interest rate, portion fixed					50.00%
Odyssey And Orion | Secured Debt | Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Debt Agreement
Debt Instrument [Line Items]
Basis spread on variable rate					2.40%
Interest rate, effective percentage												4.73%
m/v Nordic Oshima | Secured Debt
Debt Instrument [Line Items]
Face amount									$ 21,000,000
m/v Nordic Oshima | Secured Debt | Bulk Nordic Odin, Bulk Nordic Olympic, Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Loan Agreement
Debt Instrument [Line Items]
Interest rate, stated percentage														4.16%
Interest rate, portion fixed														50.00%
Oshima | Secured Debt | Bulk Nordic Odin, Bulk Nordic Olympic, Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Loan Agreement
Debt Instrument [Line Items]
Number of periodic payments | installment									28
Oshima | Secured Debt | Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Debt Agreement
Debt Instrument [Line Items]
Periodic payment, principal amount									$ 375,000
Periodic payment terms, balloon payment to be paid									$ 11,254,295
Basis spread on variable rate					2.25%
Interest rate, effective percentage												4.40%
Tranche A | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Debt Instrument [Line Items]
Face amount						19,500,000
Periodic payment terms, balloon payment to be paid						$ 8,499,991
Number of tranches | tranche						2
Tranche A | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement | Three equal quarterly installments
Debt Instrument [Line Items]
Number of periodic payments | installment						3
Periodic payment, principal amount						$ 100,000
Tranche A | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement | Seventeen equal quarterly installments
Debt Instrument [Line Items]
Number of periodic payments | installment						27
Periodic payment, principal amount						$ 266,667
Tranche A | Secured Debt | The Amended Senior Facility
Debt Instrument [Line Items]
Face amount		$ 10,000,000
Tranche B | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Debt Instrument [Line Items]
Face amount						$ 3,500,000
Number of periodic payments | installment						28
Periodic payment, principal amount						$ 65,000
Periodic payment terms, balloon payment to be paid						$ 1,680,000
Tranche C | Secured Debt | The Amended Senior Facility
Debt Instrument [Line Items]
Face amount		$ 8,500,000
Number of periodic payments | installment		26
Periodic payment, principal amount		$ 275,000
Periodic payment terms, balloon payment to be paid		1,350,000
Basis spread on variable rate												4.69%
Tranche D | Secured Debt | The Amended Senior Facility
Debt Instrument [Line Items]
Face amount		$ 1,500,000
Number of periodic payments | installment		4
Periodic payment, principal amount		$ 375,000
Tranche E | Secured Debt | Bulk Independence
Debt Instrument [Line Items]
Face amount	$ 14,000,000
Number of periodic payments | installment	20
Periodic payment, principal amount	$ 250,000
Periodic payment terms, balloon payment to be paid	$ 9,000,000
Number of quarters | quarter	8
London Interbank Offered Rate (LIBOR) | Secured Debt | Term Loan Facility of USD 13,000,000 (Nordic Bulk Barents Ltd. and Nordic Bulk Bothnia Ltd.)
Debt Instrument [Line Items]
Basis spread on variable rate										2.50%
Period one | Tranche A | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Debt Instrument [Line Items]
Interest rate, stated percentage												3.69%
Period one | Tranche B | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Debt Instrument [Line Items]
Interest rate, effective percentage												4.01%
Period one | Tranche C | Secured Debt | The Amended Senior Facility
Debt Instrument [Line Items]
Basis spread on variable rate		1.70%
Period one | Tranche E | Secured Debt | Bulk Independence
Debt Instrument [Line Items]
Interest rate, effective percentage												4.01%
Period one | London Interbank Offered Rate (LIBOR) | Tranche A | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Debt Instrument [Line Items]
Basis spread on variable rate						2.40%
Period one | London Interbank Offered Rate (LIBOR) | Tranche B | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Debt Instrument [Line Items]
Basis spread on variable rate						1.70%
Period one | London Interbank Offered Rate (LIBOR) | Tranche E | Secured Debt | Bulk Independence
Debt Instrument [Line Items]
Basis spread on variable rate	1.70%
Period two | Tranche B | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Debt Instrument [Line Items]
Interest rate, stated percentage												4.16%
Period two | Tranche C | Secured Debt | The Amended Senior Facility
Debt Instrument [Line Items]
Basis spread on variable rate		2.40%
Period two | London Interbank Offered Rate (LIBOR) | Tranche B | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Debt Instrument [Line Items]
Basis spread on variable rate						2.40%
Period two | London Interbank Offered Rate (LIBOR) | Tranche E | Secured Debt | Bulk Independence
Debt Instrument [Line Items]
Basis spread on variable rate	2.40%