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Commitments (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [Line Items]        
Revenue From Rendering Of services $ 4,589 $ 6,942    
Right of use Assets 505   $ 562 $ 674
Depreciation Right of use Assets 56 56    
Interest expense on lease liabilities 23 26    
Current lease liabilities 283   208  
Non current Lease Liabilities 420   $ 469  
Time charters leases        
Disclosure of detailed information about property, plant and equipment [Line Items]        
Revenue From Rendering Of services 4,246 4,495    
Operating lease income $ 343 $ 2,447