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Subsequent Events (Details) - USD ($)
3 Months Ended 12 Months Ended
Jan. 04, 2019
Jan. 02, 2019
Dec. 13, 2018
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 25, 2019
Subsequent Event [Line Items]                
Proceeds from sale of vessels         $ 20,545,202 $ 26,042,000 $ 13,001,000  
Gain on sale of vessel         $ 335,160 $ 2,134,767 $ (101,860)  
Subsequent Event | Restricted Stock                
Subsequent Event [Line Items]                
Granted (in shares)   781,890            
Restricted shares granted, value   $ 3,700,000            
Vesting period   3 years            
Vessel Condor                
Subsequent Event [Line Items]                
Proceeds from sale of vessels     $ 6,500,000          
Vessel Merlin | Subsequent Event                
Subsequent Event [Line Items]                
Proceeds from sale of vessels $ 6,100,000              
Line of Credit | Subsequent Event | New Ultraco Debt Facility | Eagle Bulk Ultraco LLC                
Subsequent Event [Line Items]                
Aggregate principal amount               $ 208,400,000.0
Revolving Credit Facility | Line of Credit | Subsequent Event | New Ultraco Debt Facility | Eagle Bulk Ultraco LLC                
Subsequent Event [Line Items]                
Revolving credit facility               $ 55,000,000.0
Scenario, Forecast | Vessel Condor                
Subsequent Event [Line Items]                
Gain on sale of vessel       $ 2,200,000        
Scenario, Forecast | Vessel Merlin                
Subsequent Event [Line Items]                
Gain on sale of vessel       $ 1,900,000