Commitments and Contingencies - Additional Information (Details)	1 Months Ended			3 Months Ended		6 Months Ended	9 Months Ended
	Jan. 31, 2020 USD ($)	Sep. 30, 2019 USD ($) numberOfContract numberOfVessel	Feb. 28, 2019 USD ($)	Sep. 30, 2020 USD ($) numberOfVessel	Sep. 30, 2019 USD ($) numberOfContract numberOfVessel	Sep. 30, 2019 USD ($) numberOfContract numberOfVessel	Sep. 30, 2020 USD ($) numberOfVessel	Sep. 30, 2019 USD ($) numberOfContract numberOfVessel	Aug. 04, 2020 USD ($)	Dec. 31, 2019 USD ($)
Commitments and Contingencies [Line Items]
Payment for purchase of vessels							$ 2,072,496	$ 40,201,356
Investment in newbuildings in-process				$ 15,390,635			$ 15,390,635			$ 15,357,189
Number of dry bulk vessels financed under finance leases | numberOfVessel		4		3	4	4	3	4
Sale of vessel, selling price						$ 32,000,000
Sale price at fair market value at closing, percentage		0.85			0.85	0.85		0.85
Vessel charter period obligation						15 years
Purchase obligation										$ 2,500,000
Time charter, term to completion						15 years	56 days
Noncancelable period							6 months
Lease expense				$ 52,000	$ 52,000		$ 155,000	$ 155,000
m/v Bulk Destiny
Commitments and Contingencies [Line Items]
Proceeds from financing revenue received under leases							21,000,000.0
Finance lease, right-of-use assets				$ 24,000,000.0			$ 24,000,000.0
Useful life							25 years
Term of contract				7 years			7 years
Periodic payment terms, balloon payment to be paid				$ 11,200,000			$ 11,200,000
Basis spread on variable rate							2.75%
Interest rate, effective percentage				2.98%			2.98%
m/v Bulk Beothuk
Commitments and Contingencies [Line Items]
Finance lease, right-of-use assets				$ 7,000,000.0			$ 7,000,000.0
Term of contract				5 years			5 years
Periodic payment terms, balloon payment to be paid				$ 4,000,000.0			$ 4,000,000.0
Lease Payable				$ 3,500			$ 3,500
Interest rate, stated percentage				11.83%			11.83%
Repayments lease obligation	$ 5,500,000
Sale price for lease									$ 4,600,000
m/v Bulk Trident
Commitments and Contingencies [Line Items]
Proceeds from financing revenue received under leases							$ 13,000,000.0
Term of contract				8 years			8 years
Basis spread on variable rate							1.70%
Interest rate, effective percentage				1.94%			1.94%
m/v Bulk PODS
Commitments and Contingencies [Line Items]
Proceeds from financing revenue received under leases							$ 14,800,000
Term of contract				8 years			8 years
Interest rate, effective percentage				1.93%			1.93%
m/v Bulk Spirit
Commitments and Contingencies [Line Items]
Term of contract			8 years
Periodic payment terms, balloon payment to be paid			$ 3,900,000
Payment for purchase of vessels			$ 13,000,000.0
Interest for first five years			5.10%
Introductory period			5 years
Remainder of lease term after introductory period			3 years
m/v BULK FRIENDSHIP
Commitments and Contingencies [Line Items]
Payment for purchase of vessels		$ 14,100,000
Interest for first five years				5.29%			5.29%
Purchase options, vessel				$ 7,800,000			$ 7,800,000
dwt Dry Bulk
Commitments and Contingencies [Line Items]
Number of vessel newbuilding contracts | numberOfContract		2			2	2		2
Number of vessels | numberOfVessel		4		4	4	4	4	4
Percentage of payment, second installment due				0.20			0.20
Singapore
Commitments and Contingencies [Line Items]
Lease payable				14 months			14 months
Minimum | dwt Dry Bulk
Commitments and Contingencies [Line Items]
Payment for purchase of vessels						$ 37,700,000
Maximum | dwt Dry Bulk
Commitments and Contingencies [Line Items]
Payment for purchase of vessels						$ 38,300,000