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General Information General Information (Details)	3 Months Ended								6 Months Ended	12 Months Ended
	Dec. 31, 2020 USD ($) numberOfVessel vessel	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($) vessel	Mar. 31, 2020 USD ($) vessel	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($) numberOfVessel	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) vessel	Dec. 31, 2020 USD ($) numberOfVessel vessel	Dec. 31, 2019 USD ($)	Sep. 28, 2020
Property, Plant and Equipment [Line Items]
Number of vessels	3									3
Number of dry bulk vessels financed under finance leases	4					4				4
Number of vessels sold			1	2					1
Loss on impairment of vessels | $	$ 0	$ 0	$ 1,800,000	$ 0	$ 4,800,000	$ 0	$ 0	$ 0	$ 1,800,000	$ 1,801,039	$ 4,751,143
Panamax
Property, Plant and Equipment [Line Items]
Number of vessels	2									2
Ultramax Ice Class 1C
Property, Plant and Equipment [Line Items]
Number of vessels	2									2
Supramax
Property, Plant and Equipment [Line Items]
Number of vessels	7									7
Panamax Ice Class 1A
Property, Plant and Equipment [Line Items]
Number of vessels | numberOfVessel	6									6
Nordic Bulk Ventures Holding Company Ltd.
Property, Plant and Equipment [Line Items]
Ownership percentage												66.67%
Nordic Bulk Ventures Holding Company Ltd. | Owner Of Deck Barge
Property, Plant and Equipment [Line Items]
Ownership percentage	50.00%									50.00%

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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