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Debt - Ultraco Debt Facility (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 22, 2018
USD ($)
Jun. 28, 2017
USD ($)
vessel
Feb. 28, 2017
USD ($)
Mar. 30, 2016
Jan. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
vessel
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Oct. 17, 2018
USD ($)
Dec. 29, 2017
USD ($)
Debt Instrument [Line Items]                      
Basis spread on variable rate       4.00%              
Other financing costs             $ 0 $ 2,025,514 $ 0    
Ultraco Debt Facility                      
Debt Instrument [Line Items]                      
Draw down amount             21,400,000 $ 61,200,000 $ 0    
Ultraco Lenders | Ultraco Debt Facility | Eagle Bulk Ultraco LLC                      
Debt Instrument [Line Items]                      
Loan facility aggregate principal amount   $ 61,200,000                  
Percentage of fair market value of additional vessel acquired   40.00%                  
Number of vessels to be purchased | vessel   9                  
Repayments of loans     $ 1,000,000                
Other financing costs     $ 500,000                
Debt instrument term   5 years                  
Additional borrowing capacity   $ 17,400,000.0                  
Maximum borrowing capacity fair market value of additional vessels to be financed   40.00%                  
Aggregate market value minimum threshold   150.00%                  
Liquidity reserve   $ 600,000                  
Debt service reserve covenant   600,000                  
Minimum liquidity threshold   $ 7,500,000.0                  
Percentage of consolidated total debt, minimum threshold   12.00%                  
Minimum ratio of consolidated tangible assets to consolidated total assets covenant   0.35                  
Ballast water treatment system reserve covenant   $ 4,550,000                  
Ultraco Lenders | Ultraco Debt Facility | Eagle Bulk Ultraco LLC | Minimum                      
Debt Instrument [Line Items]                      
Consolidated interest coverage ratio   2.00                  
Ultraco Lenders | Ultraco Debt Facility | Eagle Bulk Ultraco LLC | Maximum                      
Debt Instrument [Line Items]                      
Consolidated interest coverage ratio   2.50                  
Ultraco Lenders | Ultraco Debt Facility | Eagle Bulk Ultraco LLC | Scenario, Forecast                      
Debt Instrument [Line Items]                      
Debt principal amount           $ 2,100,000          
Ultraco Lenders | Ultraco Debt Facility | Eagle Bulk Ultraco LLC | LIBOR                      
Debt Instrument [Line Items]                      
Basis spread on variable rate     2.95%                
Ultraco Lenders | Ultraco Debt Facility                      
Debt Instrument [Line Items]                      
Other financing costs $ 200,000       $ 100,000            
Draw down amount $ 12,800,000       $ 8,600,000   $ 82,600,000        
Ultraco Lenders | Ultraco Debt Facility | Eagle Bulk Ultraco LLC                      
Debt Instrument [Line Items]                      
Number of vessels to be purchased | vessel             11        
Increase in capacity                   $ 12,800,000 $ 8,600,000