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Basis of Preparation And Significant Accounting Policies (Details)
 2 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 13, 2019
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
Jun. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Basis of Preparation and Significant Accounting Policies [line items]                
Working capital deficit         $ (40,412,000)      
Provision for doubtful trade receivables         68,000 $ 138,000    
Borrowing costs capitalised         $ 253,000 0 $ 0  
Number of Operating Segments         1      
Description of the nature of the benefits provided by the defined benefit plan         If the employee remains 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         $ 87,000 82,000    
Current portion of long-term borrowings         35,368,000 41,538,000    
Increase/ decrease in voyage revenues         668,000 540,000 317,000  
Increase/ decrease in voyage expenses         668,000 540,000 317,000  
Proceeds from issuance of share capital         600,000 9,653,000 0  
Undrawn borrowing facilities         12,800,000 3,000,000    
Loan Balance         $ 37,163,000 41,660,000    
Black-Scholes option pricing model                
Basis of Preparation and Significant Accounting Policies [line items]                
Historical volatility for shares, significant unobservable inputs, liabilities         80.00%      
Risk free rate         2.48%      
Expected life         1.89 years      
Expected Dividend Yield Significant Unobservable Inputs Liabilities         0.00%      
Weighted average share price         $ 2.88      
Convertible Note                
Basis of Preparation and Significant Accounting Policies [line items]                
Proceeds from issuance of share capital $ 5,000,000              
Par value per share | $ / shares $ 0.004              
Firment Shipping Inc.                
Basis of Preparation and Significant Accounting Policies [line items]                
Undrawn borrowing facilities         $ 12,800,000      
Leases                
Basis of Preparation and Significant Accounting Policies [line items]                
Depreciation method         straight-line basis      
Right-of-use assets         $ 674,000      
Date as at which entity plans to apply new IFRS initially         Jan. 01, 2019      
Title of new IFRS         IFRS 16      
Date by which application of new IFRS is required         Jan. 01, 2019      
Macquarie Bank and Hamburg Commercial Bank AG                
Basis of Preparation and Significant Accounting Policies [line items]                
Current portion of long-term borrowings         $ 35,368,000      
Hamburg Commercial Bank AG                
Basis of Preparation and Significant Accounting Policies [line items]                
Loan Balance         $ 22,200,000      
Vessels                
Basis of Preparation and Significant Accounting Policies [line items]                
Depreciation method         straight-line basis      
Useful life         25 years      
Vessels scrap rate   $ 300 $ 200 $ 250       $ 240
Increase / (decrease) in depreciation expense due to changes in scrap rates         $ (178,000) $ (86,000) $ 96,000  
Deferred dry docking costs                
Basis of Preparation and Significant Accounting Policies [line items]                
Depreciation method         straight-line basis      
Interval between vessel drydockings / special surveys         2 years 6 months