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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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