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Basis of Preparation And Significant Accounting Policies (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Basis of Preparation and Significant Accounting Policies [line items]        
Working capital deficit   $ (43,323,000)    
Provision for doubtful trade receivables   138,000 $ 47,000  
Borrowing costs capitalised   $ 0 0 $ 0
Number of Operating Segments   1    
Description of the nature of the benefits provided by the defined benefit plan   If the employees’ remain in the employment of the Company until normal retirement age, they are entitled to retirement compensation which is equal to 40% of the compensation amount that would be payable if they were dismissed at that time.    
Net defined benefit liability   $ 82,000 78,000  
Current portion of long-term borrowings   41,538,000 23,550,000  
HSH Nordbank AG and DVB Bank SE        
Basis of Preparation and Significant Accounting Policies [line items]        
Current portion of long-term borrowings   $ 41,538,000    
Vessels        
Basis of Preparation and Significant Accounting Policies [line items]        
Depreciation method   straight-line basis    
Useful life   25 years    
Vessels scrap rate $ 335 $ 250 200 240
Increase / (decrease) in depreciation expense due to changes in scrap rates   $ (86,000) $ 96,000 $ 91,000
Deferred dry docking costs        
Basis of Preparation and Significant Accounting Policies [line items]        
Depreciation method   straight-line basis    
Useful life   2.5 years