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Significant Accounting Policies, Textual (Details) | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) segment | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Accounting Policies [Abstract] |  |  |
Other comprehensive income/(loss) | $ 0 | $ 0 | $ 0
Provision for doubtful accounts | $ 0 | 0 |
Vessels, useful life | 25 years |  |
Assets held for sale | $ 0 | 0 |
Derivatives | $ 0 | $ 0 | $ 0
Effective income tax rate |  | 4.00% |
Number of reportable segments | segment | 1 |  |
Number of operating segments | segment | 1 |  |
Inventory [Line Items] |  |  |
Inventories | $ 9,265,000 | $ 4,139,000 |
Bunkers |  |  |
Inventory [Line Items] |  |  |
Inventories | 5,422,000 | 0 |
Lubricants |  |  |
Inventory [Line Items] |  |  |
Inventories | $ 3,843,000 | $ 4,139,000 |

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