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Transactions with Related Parties, textual 3 (Details)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 22, 2021
USD ($)
Vote
$ / shares
shares
Jun. 30, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
$ / shares
Related Party Transaction [Line Items]      
Proceeds from issuance of stock, net of expenses   $ 264  
Aggregate principal amount   $ 100,819  
Preferred Stock      
Related Party Transaction [Line Items]      
Nominal value | $ / shares   $ 0.01 $ 0.01
Mrs. Semiramis Paliou      
Related Party Transaction [Line Items]      
Percentage of number of votes entitled to vote on any matter, Series D preferred stockholders 15.00%    
Purchase of Bond by executives      
Related Party Transaction [Line Items]      
Aggregate principal amount $ 21,000    
Series D preferred stock      
Related Party Transaction [Line Items]      
Stock Issued During Period Shares New Issues | shares   400  
Series D preferred stock | Preferred Stock      
Related Party Transaction [Line Items]      
Stock Issued During Period Shares New Issues | shares 400    
Nominal value | $ / shares $ 0.01    
Gross purchase price $ 360    
Proceeds from issuance of stock, net of expenses $ 264    
Maximum number of votes eligible | Vote 100,000    
Series D preferred stock | Mrs. Semiramis Paliou      
Related Party Transaction [Line Items]      
Stock Issued During Period Shares New Issues | shares 400    
Nominal value | $ / shares $ 0.01    
Percentage of number of votes entitled to vote on any matter total 36.00%