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VESSEL ACQUISITIONS AND DISPOSITIONS (Details) |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 08, 2021 USD ($) | Dec. 17, 2020 USD ($) item | Jun. 05, 2020 | Jun. 04, 2020 | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) item | Dec. 31, 2020 USD ($) item | Apr. 20, 2021 USD ($)
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |
Restricted cash, current |  |  |  |  |  | $ 40,519,000 | $ 35,492,000 |
Secured Debt | $495 Million Credit Facility |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 495,000,000 |  |
Restricted cash, current |  |  |  |  |  | $ 40,519,000 | $ 35,492,000 |
Period for which sales proceeds from vessels will remain as restricted cash |  |  |  |  |  | 360 days |  |
Collateral vessel replacement period |  |  | 360 days | 180 days |  | 360 days |  |
Number of vessels sold which served as collateral | item |  |  |  |  |  | 9 | 8 |
Secured Debt | $133 Million Credit Facility |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 133,000,000 |  |
Agreement To Exchange Vessels |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |
Adjusted total fair market value of vessels |  | $ 46,000,000 |  |  |  |  |  |
Broker commission (as a percent) |  | 1.00% |  |  |  |  |  |
Subsequent Event | Agreement to Purchase Ultramax Drybulk Vessels |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |
Aggregate purchase price for vessels |  |  |  |  |  |  |  | $ 20,200,000
Ultramax Vessels | Agreement To Exchange Vessels |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |
Number of vessels to be exchanged | item |  | 3 |  |  |  |  |  |
Handysize Vessels | Agreement To Exchange Vessels |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |
Number of vessels to be exchanged | item |  | 6 |  |  |  |  |  |
Baltic Leopard | Subsequent Event |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |
Sale of assets | $ 8,000,000 |  |  |  |  |  |  |
Broker commission (as a percent) | 2.00% |  |  |  |  |  |  |
Baltic Leopard | Subsequent Event | Secured Debt | $495 Million Credit Facility |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |
Restricted cash, current | $ 4,087,000 |  |  |  |  |  |  |
Period for which sales proceeds from vessels will remain as restricted cash | 360 days |  |  |  |  |  |  |
Collateral vessel replacement period | 360 days |  |  |  |  |  |  |
Genco Lorraine | Forecast |  |  |  |  |  |  |  |
VESSEL ACQUISITIONS |  |  |  |  |  |  |  |
Sale of assets |  |  |  |  | $ 7,950,000 |  |  |
Broker commission (as a percent) |  |  |  |  | 2.50% |  |  |

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