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Advances for vessels under construction and acquisition of vessels (Details Narrative)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
OCC Vessels [Member]  
Lessor, Lease, Description [Line Items]  
Stock Issued During Period, Value, Acquisitions $ 42,962
OCC Vessels [Member] | Financed by CSSC [Member]  
Lessor, Lease, Description [Line Items]  
Capital Leased Assets, Number of Units 3
OCC Vessels [Member] | Financed by CSSC [Member] | First OCC Vessel [Member]  
Lessor, Lease, Description [Line Items]  
Capital lease obligation recognised $ 4,350
OCC Vessels [Member] | Financed by CSSC [Member] | Second OCC Vessel [Member]  
Lessor, Lease, Description [Line Items]  
Capital lease obligation recognised 4,350
Star Marianne And Star Janni [Member]  
Lessor, Lease, Description [Line Items]  
Advances for vessels under construction $ 4,880