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Long-Term Debt and Other Financial Liabilities, Sale and Leaseback Transactions for Hellasship and Patriotship (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
Affiliate
Installment
Jun. 22, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sale and Leaseback Transaction [Abstract]      
Balance outstanding $ 207,917   $ 173,289
Sale and Leaseback Agreements for Hellasship and Patriotship [Member]      
Sale and Leaseback Transaction [Abstract]      
Face amount   $ 30,900  
Number of affiliates of CMBFL in sale and leaseback transaction | Affiliate 2    
Term of charter contract 5 years    
Minimum liquidity to be maintained in earnings account $ 550    
Minimum value maintenance ratio to be maintained 1.20    
Number of consecutive payment installments | Installment 20    
Frequency of periodic payment quarterly    
Installment payment $ 780    
Balloon payment $ 15,300    
Maturity date Jun. 28, 2026    
Balance outstanding $ 30,900    
Sale and Leaseback Agreements for Hellasship and Patriotship [Member] | Maximum [Member]      
Sale and Leaseback Transaction [Abstract]      
Corporate leverage ratio 85.00%    
Sale and Leaseback Agreements for Hellasship and Patriotship [Member] | LIBOR [Member]      
Sale and Leaseback Transaction [Abstract]      
Margin on variable rate 3.50%