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Commitments and Contingencies - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
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Oct. 26, 2018 USD ($) | Jan. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) numberOfContract numberOfVessel | Feb. 28, 2019 USD ($) | Dec. 31, 2020 USD ($) vessel | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) numberOfContract numberOfVessel | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) numberOfContract numberOfVessel | Dec. 31, 2020 USD ($) vessel | Dec. 31, 2019 USD ($) | Aug. 04, 2020 USD ($)
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels useful life |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Loss on sales of vessels |  |  |  |  | $ 0 | $ 500,000 | $ 300,000 | $ (100,000) | $ 4,600,000 | $ 0 | $ 0 | $ 0 |  | $ 730,065 | $ 4,584,796 |
Purchase of vessels |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,892,776 | 41,350,536 |
Finance lease, weighted average remaining lease term |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Noncancelable office lease period |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 months |  |
Number of vessels | vessel |  |  |  |  | 3 |  |  |  |  |  |  |  |  | 3 |  |
Contracted maximum selling price |  |  |  |  |  |  |  |  |  |  |  |  | $ 32,000,000 |  |  |
Contracted selling price at fair market value, percentage |  |  | 0.85 |  |  |  |  |  |  | 0.85 |  |  | 0.85 |  |  |
Vessel charter period |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |
Purchase obligation |  |  | $ 2,500,000 |  |  |  |  |  |  | $ 2,500,000 |  |  | $ 2,500,000 |  |  |
Time charter, term to completion |  |  |  |  |  |  |  |  |  |  |  |  | 15 years | 30 days |  |
Lease, cost |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 200,000 | 200,000 |
Investment in newbuildings in-process |  |  | $ 15,400,000 |  | $ 15,390,635 |  |  |  | $ 15,357,189 | $ 15,400,000 |  |  | $ 15,400,000 | $ 15,390,635 | $ 15,357,189 |
Number of dry bulk vessels financed under finance leases |  |  | 4 |  | 4 |  |  |  |  | 4 |  |  | 4 | 4 |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel lease term |  |  |  |  | 20 days |  |  |  |  |  |  |  |  | 20 days |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel lease term |  |  |  |  | 83 days |  |  |  |  |  |  |  |  | 83 days |  |
m/v BULK DESTINY |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale leaseback transaction, gross proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 21,000,000.0 |  |
Vessels useful life |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 years |  |
Term of contract |  |  |  |  | 7 years |  |  |  |  |  |  |  |  | 7 years |  |
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% |  |
Vessels under finance lease |  |  |  |  | $ 24,000,000.0 |  |  |  |  |  |  |  |  | $ 24,000,000.0 |  |
m/v BULK BEOTHUK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease payable |  |  |  |  | $ 3,500 |  |  |  |  |  |  |  |  | $ 3,500 |  |
Term of contract |  |  |  |  | 5 years |  |  |  |  |  |  |  |  | 5 years |  |
Balloon payment to be paid |  |  |  |  | $ 4,000,000.0 |  |  |  |  |  |  |  |  | $ 4,000,000.0 |  |
Interest rate, stated percentage |  |  |  |  | 11.83% |  |  |  |  |  |  |  |  | 11.83% |  |
Repayments lease obligation |  | $ 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessels under finance lease |  |  |  |  | $ 7,000,000.0 |  |  |  |  |  |  |  |  | $ 7,000,000.0 |  | $ 4,600,000
m/v BULK TRIDENT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of contract |  |  |  |  | 8 years |  |  |  |  |  |  |  |  | 8 years |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.70% |  |
Interest rate, effective percentage |  |  |  |  | 1.93% |  |  |  |  |  |  |  |  | 1.93% |  |
Vessels under finance lease |  |  |  |  | $ 13,000,000.0 |  |  |  |  |  |  |  |  | $ 13,000,000.0 |  |
m/v BULK PODS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.70% |  |
Interest rate, effective percentage |  |  |  |  | 1.94% |  |  |  |  |  |  |  |  | 1.94% |  |
Vessels under finance lease |  |  |  |  | $ 14,800,000 |  |  |  |  |  |  |  |  | $ 14,800,000 |  |
m/v Bulk PODS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of contract |  |  |  |  | 8 years |  |  |  |  |  |  |  |  | 8 years |  |
m/v BULK SPIRIT |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term of contract |  |  |  | 8 years |  |  |  |  |  |  |  |  |  |  |  |
Balloon payment to be paid |  |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase of vessels | $ 13,000,000.0 |  |  | $ 13,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |
Finance lease, weighted average discount rate, percent |  |  |  | 5.10% |  |  |  |  |  |  |  |  |  |  |  |
Finance leases, minimum payments period |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Bulk Friendship |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of vessels |  |  | $ 14,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Finance lease, weighted average discount rate, percent |  |  | 5.29% |  |  |  |  |  |  | 5.29% |  |  | 5.29% |  |  |
Purchase options, vessel |  |  | $ 7,800,000 |  |  |  |  |  |  | $ 7,800,000 |  |  | $ 7,800,000 |  |  |
dwt DRY BULK |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vessels | numberOfVessel |  |  | 4 |  |  |  |  |  |  | 4 |  |  | 4 |  |  |
Percentage of payment installment due, installment two |  |  | 0.20 |  |  |  |  |  |  | 0.20 |  |  | 0.20 |  |  |
Number of vessel newbuilding contracts | numberOfContract |  |  | 2 |  |  |  |  |  |  | 2 |  |  | 2 |  |  |
dwt DRY BULK | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of vessels |  |  |  |  |  |  |  |  |  |  |  |  | $ 37,700,000 |  |  |
dwt DRY BULK | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of vessels |  |  |  |  |  |  |  |  |  |  |  |  | $ 38,300,000 |  |  |
SINGAPORE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Weighted Average Remaining Lease Term |  |  |  |  | 11 months |  |  |  |  |  |  |  |  | 11 months |  |

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