Commitments and Contingencies - Additional Information (Details)	1 Months Ended			3 Months Ended		6 Months Ended	12 Months Ended
	Jan. 31, 2020 USD ($)	Sep. 30, 2019 USD ($) contract vessel	Feb. 28, 2019 USD ($)	Mar. 31, 2020 USD ($) vessel	Mar. 31, 2019 USD ($)	Sep. 30, 2019 USD ($) contract vessel	Dec. 31, 2018	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)
Commitments and Contingencies [Line Items]
Number of dry bulk vessels financed under finance leases | vessel		4		3		4
Payment for purchase of vessels				$ 283,446	$ 11,426,174
Investment in newbuildings in-process				$ 15,390,634				$ 15,357,189
Remainder of lease term after introductory period			3 years
Noncancelable period							6 months
Sale of vessel, selling price						$ 32,000,000
Sale price at fair market value at closing, percentage									0.85
Vessel charter period obligation						15 years
Purchase obligation									$ 2,500,000
Time charter, term to completion				31 days		15 years
Lease expense				$ 52,000	$ 52,000
m/v Bulk Destiny
Commitments and Contingencies [Line Items]
Sale leaseback transaction, proceeds				21,000,000
Capital leased assets, gross				$ 24,000,000
Useful life				25 years
Lease terms				Minimum lease payments fluctuate based on three-month LIBOR and are payable quarterly over the seven year lease term
Periodic payment terms, balloon payment to be paid				$ 11,200,000.0
Basis spread on variable rate				2.75%
Interest rate, effective percentage				4.65%
Term of contract				7 years
m/v Bulk Beothuk
Commitments and Contingencies [Line Items]
Capital leased assets, gross				$ 7,000,000
Lease terms				The lease is payable at $3,500 per day every fifteen days over the five year lease term
Periodic payment terms, balloon payment to be paid				$ 4,000,000.0
Lease payable				$ 3,500
Interest rate, stated percentage				11.83%
Repayments lease obligation	$ 5,500,000
Term of contract				5 years
m/v Bulk Trident
Commitments and Contingencies [Line Items]
Sale leaseback transaction, proceeds				$ 13,000,000
Basis spread on variable rate				1.70%
Interest rate, effective percentage				3.15%
Term of contract				8 years
m/v Bulk PODS
Commitments and Contingencies [Line Items]
Sale leaseback transaction, proceeds				$ 14,750,000
Interest rate, effective percentage				2.90%
Term of contract				8 years
m/v Bulk Spirit
Commitments and Contingencies [Line Items]
Periodic payment terms, balloon payment to be paid			$ 3,875,000
Term of contract			8 years
Payment for purchase of vessels			$ 13,000,000
Interest for first five years			5.10%
Introductory period			5 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%
Purchase options, vessel				$ 7,780,000
dwt Dry Bulk
Commitments and Contingencies [Line Items]
Number of vessel newbuilding contracts | contract		2				2
Number of vessels | vessel		4				4
Percentage of payment, second installment due		0.20				0.20
Singapore
Commitments and Contingencies [Line Items]
Operating lease, weighted average remaining lease term				9 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