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Basis of Presentation and General Information - Concentration Risk by Charterer (Details) - Sales Revenue, Net [Member]
12 Months Ended
Dec. 31, 2019
Charterer A [Member]  
Concentration risk, percentage 12.00%
Charterer B [Member]  
Concentration risk, percentage 10.00%
Charterer C [Member]  
Concentration risk, percentage 10.00%