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Revenues from continuing operations (Details Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Unearned revenue $ 2,821 $ 3,826
Prepaid Expenses and Other Current Assets [Member]    
Prepaid Expense and Other Assets, Current 80 0
Accounts Payable and Accrued Liabilities [Member]    
Unearned revenue $ 0 $ 0
Minimum [Member] | Thirteen Vessels Under Time Charter Agreements [Member]    
Remaining tenor of time charter agreements (in years) 0.4  
Minimum [Member] | Four Time Charter Agreements With Extensions In Charterers Option [Member]    
Remaining tenor of time charter agreements (in years) 0.6  
Maximum [Member] | Thirteen Vessels Under Time Charter Agreements [Member]    
Remaining tenor of time charter agreements (in years) 5.3  
Maximum [Member] | Four Time Charter Agreements With Extensions In Charterers Option [Member]    
Remaining tenor of time charter agreements (in years) 2.0