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Secured Long-term Debt - Narrative (Details)										1 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 23, 2020 USD ($) installment	May 13, 2019 USD ($) installment	Dec. 21, 2017 USD ($) installment	Jun. 14, 2017 USD ($) installment	Jan. 07, 2017 USD ($) tranche installment	May 27, 2016 USD ($) installment	Dec. 11, 2015 USD ($) installment	Sep. 28, 2015 USD ($) installment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Apr. 27, 2017	Mar. 31, 2017	Jan. 31, 2017
Long-term Debt [Line Items]
Long-term debt, gross	$ 105,787,590										$ 105,787,590
Secured Debt
Long-term Debt [Line Items]
Long-term debt, gross	$ 105,787,590										$ 105,787,590	$ 110,778,263
Secured Debt | Bulk Nordic Oasis Ltd. Loan Agreement
Long-term Debt [Line Items]
Face amount								$ 21,500,000
Periodic payment, principal amount								375,000
Balloon payment to be paid								$ 12,500,000
Interest rate, stated percentage	4.30%							4.30%			4.30%
Long-term debt, gross	$ 14,000,000										$ 14,000,000	15,500,000
Secured Debt | m/v NORDIC OASIS
Long-term Debt [Line Items]
Number of periodic payments | installment								24
Secured Debt | Bulk Freedom Loan Agreement
Long-term Debt [Line Items]
Face amount					$ 5,500,000
Balloon payment to be paid					$ 2,300,000
Interest rate, stated percentage	4.03%										4.03%
Basis spread on variable rate					3.75%						4.03%
Long-term debt, gross	$ 3,200,000										$ 3,200,000	3,800,000
Secured Debt | 109 Long Wharf Commercial Term Loan
Long-term Debt [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%
Secured Debt | Bulk Endurance Senior Tranche Loan
Long-term Debt [Line Items]
Face amount						$ 16,000,000
Secured Debt | Bulk Nordic Odyssey (MI) Corp., Bulk Nordic Orion (MI) Corp. Senior Secured Term Loan Facility
Long-term Debt [Line Items]
Face amount		$ 18,000,000
Number of periodic payments | installment		28
Periodic payment, principal amount		$ 571,821
Balloon payment to be paid		$ 4,400,000
Interest rate, stated percentage	0.0295%	2.95%									0.0295%
Long-term debt, gross	$ 18,000,000										$ 18,000,000	$ 0
m/v Nordic Odin and m/v Nordic Olympic | Secured Debt
Long-term Debt [Line Items]
Face amount									$ 21,750,000
m/v Nordic Odin and m/v Nordic Olympic | Secured Debt | Bulk Nordic Odin, Bulk Nordic Olympic, Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Loan Agreement
Long-term Debt [Line Items]
Number of periodic payments | installment									28
Periodic payment, principal amount									$ 375,000
Balloon payment to be paid									11,233,150
Interest rate, stated percentage													4.07%		4.16%
Odyssey and Orion | Secured Debt
Long-term Debt [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
Long-term Debt [Line Items]
Number of periodic payments | installment									20
Periodic payment, principal amount									$ 5,677,203	$ 375,000
Balloon payment to be paid									$ 375,000
Interest rate, portion fixed														50.00%
Interest rate, stated percentage															3.95%
Odyssey and Orion | Secured Debt | Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Debt Agreement
Long-term Debt [Line Items]
Basis spread on variable rate									2.00%
m/v NORDIC OSHIMA | Secured Debt
Long-term Debt [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
Long-term Debt [Line Items]
Interest rate, portion fixed															50.00%
m/v NORDIC OSHIMA | Secured Debt | Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Debt Agreement
Long-term Debt [Line Items]
Interest rate, effective percentage	2.48%										2.48%
Nordic Bulk Oshima | Secured Debt | Bulk Nordic Odin, Bulk Nordic Olympic, Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Loan Agreement
Long-term Debt [Line Items]
Number of periodic payments | installment									28
Nordic Bulk Oshima | Secured Debt | Bulk Nordic Odyssey, Bulk Nordic Orion and Bulk Nordic Oshima Debt Agreement
Long-term Debt [Line Items]
Periodic payment, principal amount									$ 375,000
Balloon payment to be paid									$ 11,254,295
Basis spread on variable rate	2.25%
Eight equal quarterly installments | Secured Debt | Bulk Freedom Loan Agreement
Long-term Debt [Line Items]
Number of periodic payments | installment					8
Periodic payment, principal amount					$ 175,000
Twelve equal quarterly installments | Secured Debt | Bulk Freedom Loan Agreement
Long-term Debt [Line Items]
Number of periodic payments | installment					12
Periodic payment, principal amount					$ 150,000
Tranche A | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Number of periodic payments | installment						27
Balloon payment to be paid						$ 8,766,658
Number of tranches | tranche						2
Tranche A | Secured Debt | Bulk Endurance Senior Tranche Loan
Long-term Debt [Line Items]
Face amount						$ 19,500,000
Tranche A | Three equal quarterly installments | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Periodic payment, principal amount						100,000
Tranche A | Seventeen equal quarterly installments | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Periodic payment, principal amount						266,667
Tranche B | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Face amount						$ 3,500,000
Number of periodic payments | installment						28
Periodic payment, principal amount						$ 65,000
Balloon payment to be paid						$ 1,745,000
Tranche C and B [Member] | Secured Debt | The Amended Senior Facility
Long-term Debt [Line Items]
Face amount				$ 10,000,000
Tranche C | Secured Debt | The Amended Senior Facility
Long-term Debt [Line Items]
Face amount				$ 8,500,000
Number of periodic payments | installment				26
Periodic payment, principal amount				$ 275,000
Balloon payment to be paid				1,350,000
Tranche D | Secured Debt | The Amended Senior Facility
Long-term Debt [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
Long-term Debt [Line Items]
Face amount			$ 14,000,000
Number of periodic payments | installment			20
Periodic payment, principal amount			$ 250,000
Balloon payment to be paid			$ 9,000,000
Interest Rate Period One | Tranche A | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Interest rate, stated percentage	3.69%										3.69%
Interest Rate Period One | Tranche B | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Interest rate, effective percentage	1.93%										1.93%
Interest Rate Period One | Tranche C | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Interest rate, stated percentage	4.69%										4.69%
Interest Rate Period One | Tranche E | Secured Debt | Bulk Independence
Long-term Debt [Line Items]
Interest rate, stated percentage	3.48%										3.48%
Basis spread on variable rate											3.54%
Interest Rate Period Two | Tranche B | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Interest rate, stated percentage	4.39%										4.39%
Interest Rate Period Two | Tranche C | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Interest rate, stated percentage	5.39%										5.39%
Interest Rate Period Two | Tranche E | Secured Debt | Bulk Independence
Long-term Debt [Line Items]
Interest rate, stated percentage	2.84%										2.84%
London Interbank Offered Rate (LIBOR) | Interest Rate Period One | Tranche A | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Basis spread on variable rate						3.46%
London Interbank Offered Rate (LIBOR) | Interest Rate Period One | Tranche B | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Basis spread on variable rate						1.70%
London Interbank Offered Rate (LIBOR) | Interest Rate Period One | Tranche C | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Basis spread on variable rate											3.60%
London Interbank Offered Rate (LIBOR) | Interest Rate Period One | Tranche E | Secured Debt | Bulk Independence
Long-term Debt [Line Items]
Basis spread on variable rate			1.70%
London Interbank Offered Rate (LIBOR) | Interest Rate Period Two | Tranche B | Secured Debt | Bulk Nordic Six Ltd. Loan Agreement
Long-term Debt [Line Items]
Basis spread on variable rate						2.40%
London Interbank Offered Rate (LIBOR) | Interest Rate Period Two | Tranche E | Secured Debt | Bulk Independence
Long-term Debt [Line Items]
Basis spread on variable rate			2.40%

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