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Financial risk management objectives and policies - Liquidity risk (Table) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Disclosure of financial liabilities [line items]    
Long-term debt $ 50,697 $ 42,687
Lease liabilities 800 0
Accrued liabilities and other payables 1,971 1,319
Trade payables 4,735 6,433
Total 58,203 50,439
Less than 3 months    
Disclosure of financial liabilities [line items]    
Long-term debt 4,674 1,720
Lease liabilities 126 0
Accrued liabilities and other payables 1,971 1,319
Trade payables 4,735 6,433
Total 11,506 9,472
3 to 12 months    
Disclosure of financial liabilities [line items]    
Long-term debt 3,776 24,502
Lease liabilities 106 0
Accrued liabilities and other payables 0 0
Trade payables 0 0
Total 3,882 24,502
1 to 5 years    
Disclosure of financial liabilities [line items]    
Long-term debt 42,247 16,465
Lease liabilities 567 0
Accrued liabilities and other payables 0 0
Trade payables 0 0
Total 42,814 16,465
More than 5 years    
Disclosure of financial liabilities [line items]    
Long-term debt 0 0
Lease liabilities 1 0
Accrued liabilities and other payables 0 0
Trade payables 0 0
Total $ 1 $ 0