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Transactions with Related Parties, Management Agreements (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended 18 Months Ended
Dec. 27, 2022
USD ($)
Agreement
Vessel
Mar. 31, 2023
Dec. 31, 2023
USD ($)
Vessel
Dec. 31, 2023
USD ($)
Vessel
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2023
USD ($)
Vessel
Dec. 28, 2022
USD ($)
Transactions with Related Parties [Abstract]                
Fees from related parties       $ 3,198 $ 2,391 $ 0    
Gain on sale of vessels, net       $ 8,094 0 697    
Master Management Agreement [Member]                
Transactions with Related Parties [Abstract]                
Notice period for non-renewal of agreement       3 months        
Automatic extension period of agreement       12 months        
United [Member]                
Transactions with Related Parties [Abstract]                
Fees from related parties       $ 3,198 2,391      
Due from related parties     $ 308 308 829   $ 308  
Number of memoranda of agreement | Agreement 2              
Number of vessels to be sold | Vessel 2              
Sales price $ 36,250              
Advance in cash     $ 0 0 12,688   0 $ 12,688
Gain on sale of vessels, net       $ 8,094    
United [Member] | Master Management Agreement [Member]                
Transactions with Related Parties [Abstract]                
Daily fixed administration fee per vessel             $ 325  
United [Member] | Technical Management Agreement [Member] | Seanergy Shipmanagement [Member]                
Transactions with Related Parties [Abstract]                
Number of vessels managed by related party | Vessel     5 5     5  
United [Member] | Technical Management Agreement [Member] | Seanergy Shipmanagement [Member] | Minimum [Member]                
Transactions with Related Parties [Abstract]                
Fixed management fee per month       $ 10        
Number of vessels charged monthly fixed management fee | Vessel       1        
United [Member] | Technical Management Agreement [Member] | Seanergy Shipmanagement [Member] | Maximum [Member]                
Transactions with Related Parties [Abstract]                
Fixed management fee per month       $ 14        
Number of vessels charged monthly fixed management fee | Vessel       4        
United [Member] | Commercial Management Agreement [Member] | Seanergy Management [Member]                
Transactions with Related Parties [Abstract]                
Commercial management fee   1.25% 0.75%          
Percentage of fee on purchase or sale of vessel   1.00% 1.00%