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Significant Accounting Policies, textual (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accounting Policies |  |  |
Other comprehensive income/(loss) | $ 0 | $ 0 | $ 0
Provision for Doubtful Accounts | $ 0 | 0 | 0
Property, Plant and Equipment, Useful Life | 25 years |  |
Impairment of Long-Lived Assets Held-for-use |  |  | $ 0
Assets held for sale | $ 0 |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate | 4.00% |  |
Inventory [Line Items] |  |  |
Inventories | $ 5,174 | 5,167 |
Bunkers |  |  |
Inventory [Line Items] |  |  |
Inventories | 1,478 | 1,302 |
Lubricants |  |  |
Inventory [Line Items] |  |  |
Inventories | $ 3,696 | $ 3,865 |

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