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Significant Accounting Policies - Schedule of Revenue Disaggregated by Revenue Source (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues, net $ 21,711 $ 27,753 $ 28,457
Revenues Derived from Spot Charters, Net [Member]      
Revenues, net 7,022 8,067 16,990
Revenues Derived from Time Charters, Net [Member]      
Revenues, net $ 14,689 $ 19,686 $ 11,467