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Unearned Revenue/Accrued Revenue, Detail (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Unearned Revenue    
Cash received in advance of service provided – Current liability $ 1,826 $ 4,925
Deferred revenue resulting from varying charter rates – Current liability 1,214 484
Deferred revenue resulting from varying charter rates – Non-Current liability 648 253
Total Unearned Revenue 3,688 5,662
Accrued Revenue    
Resulting from varying charter rates – Current asset 158 475
Resulting from varying charter rates – Non-Current asset 455 614
Total Accrued Revenue $ 613 $ 1,089