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Debt - Ultraco Debt Facility (Details)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 22, 2018
USD ($)
Jun. 28, 2017
USD ($)
vessel
Mar. 30, 2016
Jan. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2018
USD ($)
vessel
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Oct. 17, 2018
USD ($)
Dec. 29, 2017
USD ($)
Debt Instrument [Line Items]                    
Basis spread on variable rate     4.00%              
Repayments of long-term debt               $ 13,021,000    
Payments of financing costs           $ 0 $ 918,000      
Ultraco Debt Facility                    
Debt Instrument [Line Items]                    
Proceeds from issuance of long-term debt           8,600,000 $ 61,200,000      
Ultraco Lenders | Ultraco Debt Facility                    
Debt Instrument [Line Items]                    
Payments of financing costs       $ 100,000            
Proceeds from issuance of long-term debt       $ 8,600,000   69,800,000        
Deposits on vessel purchases           $ 4,200,000   $ 2,200,000    
Eagle Bulk Ultraco LLC | Ultraco Lenders | Ultraco Debt Facility                    
Debt Instrument [Line Items]                    
Secured term loan aggregate principal maximum amount   $ 61,200,000                
Maximum percentage borrowing capacity of vessels to be acquired   40.00%                
Number of vessels to be purchased | vessel   9       10        
Repayments of long-term debt   $ 900,000                
Payments of financing costs   $ 500,000                
Increase in commitments                   $ 8,600,000
Debt instrument, term   5 years                
Ultraco additional borrowing capacity   $ 30,200,000                
Ultraco maximum percentage borrowing capacity of additional vessels to be financed   40.00%                
Aggregate market value minimum threshold   150.00%                
Ultraco facility liquidity reserve   $ 600,000                
Ultraco facility debt service reserve   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   $ 4,550,000                
Eagle Bulk Ultraco LLC | Ultraco Lenders | Ultraco Debt Facility | Minimum                    
Debt Instrument [Line Items]                    
Interest coverage ratio   2.00                
Eagle Bulk Ultraco LLC | Ultraco Lenders | Ultraco Debt Facility | Maximum                    
Debt Instrument [Line Items]                    
Interest coverage ratio   2.50                
Eagle Bulk Ultraco LLC | Ultraco Lenders | Ultraco Debt Facility | Forecast                    
Debt Instrument [Line Items]                    
Periodic principal payment         $ 1,787,571          
Eagle Bulk Ultraco LLC | Ultraco Lenders | Ultraco Debt Facility | LIBOR                    
Debt Instrument [Line Items]                    
Basis spread on variable rate   2.95%                
Subsequent Event | Ultraco Lenders | Ultraco Debt Facility                    
Debt Instrument [Line Items]                    
Payments of financing costs $ 200,000                  
Proceeds from issuance of long-term debt $ 12,800,000                  
Subsequent Event | Eagle Bulk Ultraco LLC | Ultraco Lenders | Ultraco Debt Facility                    
Debt Instrument [Line Items]                    
Increase in commitments                 $ 12,800,000