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Debt - Ultraco Debt Facility (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 28, 2017
USD ($)
vessel
Feb. 28, 2017
USD ($)
Mar. 30, 2016
Jan. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2017
USD ($)
vessel
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 29, 2017
USD ($)
Debt Instrument [Line Items]                  
Basis spread on variable rate     4.00%            
Repayments of loans           $ 13,021,000      
Other financing costs           2,025,514 $ 0 $ 500,000  
Ultraco Debt Facility                  
Debt Instrument [Line Items]                  
Draw down amount           61,200,000 $ 0 $ 0  
Ultraco Lenders | Ultraco Debt Facility                  
Debt Instrument [Line Items]                  
Draw down amount           61,200,000      
Deposit paid on purchase of vessel           $ 2,200,000      
Ultraco Lenders | Ultraco Debt Facility | Eagle Bulk Ultraco LLC                  
Debt Instrument [Line Items]                  
Loan facility aggregate principal amount $ 61,200,000               $ 8,600,000
Percentage of fair market value of additional vessel acquired 40.00%                
Number of vessels to be purchased | vessel 9         9      
Repayments of loans   $ 918,000              
Other financing costs   $ 459,735              
Debt instrument term 5 years                
Additional borrowing capacity $ 38,800,000                
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                
Increase in capacity                 $ 8,600,000
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         $ 1,602,270        
Ultraco Lenders | Ultraco Debt Facility | Eagle Bulk Ultraco LLC | LIBOR                  
Debt Instrument [Line Items]                  
Basis spread on variable rate   2.95%              
Subsequent Event | Ultraco Lenders | Ultraco Debt Facility                  
Debt Instrument [Line Items]                  
Draw down amount       $ 8,600,000