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Transactions with related parties - Loan from related party (Details) - Dynagas Holding Ltd - USD ($) $ in Thousands | 10 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | ---
Nov. 14, 2018 | Nov. 18, 2013 | Dec. 31, 2019 | Dec. 31, 2018
$30 million Sponsor Facility |  |  |  |
Debt Instruments |  |  |  |
Revolving credit facility borrowing capacity |  | $ 30,000 | $ 30,000 |
Duration of facility |  | 5 years |  |
Line of credit facility, expiration date |  |  | Nov. 30, 2023 |
Revolving credit facility amount drawn down |  |  | $ 0 | $ 0
$30 million Extended Sponsor Facility |  |  |  |
Debt Instruments |  |  |  |
Duration of facility | 5 years |  |  |

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