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Vessels - Additional Information (Details)
3 Months Ended
Mar. 23, 2018
USD ($)
Aug. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
vessel
Mar. 31, 2017
USD ($)
Dec. 19, 2017
USD ($)
Property, Plant and Equipment [Line Items]              
Number of vessels | vessel         48    
Proceeds from sale of vessels         $ 0 $ 5,790,500  
Gain on sale of vessels         $ 0 $ 92,114  
SDARI-64 Ultramax Dry Bulk Vessel              
Property, Plant and Equipment [Line Items]              
Vessel purchase price             $ 21,300,000
Vessel Avocet              
Property, Plant and Equipment [Line Items]              
Proceeds from sale of vessels   $ 9,600,000          
Vessel Thrush              
Property, Plant and Equipment [Line Items]              
Proceeds from sale of vessels $ 10,900,000            
Forecast | Vessel Avocet              
Property, Plant and Equipment [Line Items]              
Gain on sale of vessels       $ 300,000      
Forecast | Vessel Thrush              
Property, Plant and Equipment [Line Items]              
Gain on sale of vessels     $ 400,000