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Debt - Ultraco Debt Facility (Details) - Ultraco Debt Facility
3 Months Ended 9 Months Ended
Jun. 28, 2017
USD ($)
vessel
Feb. 28, 2017
Mar. 31, 2019
USD ($)
Sep. 30, 2017
USD ($)
vessel
Sep. 30, 2016
USD ($)
Debt Instrument [Line Items]          
Proceeds from Ultraco Debt Facility       $ 61,200,000 $ 0
Ultraco Lenders          
Debt Instrument [Line Items]          
Proceeds from Ultraco Debt Facility       $ 61,200,000  
Eagle Bulk Ultraco LLC | Ultraco Lenders          
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     9  
Ultraco debt facility maturity, in years 5 years        
Ultraco additional borrowing capacity $ 38,800,000        
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        
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 | Minimum          
Debt Instrument [Line Items]          
Interest coverage ratio 2        
Eagle Bulk Ultraco LLC | Ultraco Lenders | Maximum          
Debt Instrument [Line Items]          
Interest coverage ratio 2.5        
Eagle Bulk Ultraco LLC | Ultraco Lenders | Forecast          
Debt Instrument [Line Items]          
Ultraco periodic principal repayments     $ 1,602,270    
Eagle Bulk Ultraco LLC | Ultraco Lenders | LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate   2.95%