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Significant Accounting Policies, textual (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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% |  |
Inventory [Line Items] |  |  |
Inventories | $ 4,139,000 | 4,227,000 |
Bunkers |  |  |
Inventory [Line Items] |  |  |
Inventories | 0 | 724,000 |
Lubricants |  |  |
Inventory [Line Items] |  |  |
Inventories | $ 4,139,000 | $ 3,503,000 |

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