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General Information (Details Textual)
Nov. 08, 2018
shares
Sep. 30, 2018
USD ($)
vessel
shares
Dec. 31, 2017
USD ($)
shares
Property, Plant and Equipment [Line Items]      
Shares of common stock sold to institutional and accredited investors | shares   44,048,541 43,794,526
Common Stock, Value, Issued | $   $ 4,405 $ 4,379
Common Stock, Shares, Outstanding | shares   44,048,541 43,794,526
Entity Common Stock, Shares Outstanding | shares 44,048,541    
Panamax Ice Class 1A [Member]      
Property, Plant and Equipment [Line Items]      
Number of vessels   6  
Panamax [Member]      
Property, Plant and Equipment [Line Items]      
Number of vessels   3  
Supramax [Member]      
Property, Plant and Equipment [Line Items]      
Number of vessels   6  
Handymax Ice Class 1A [Member]      
Property, Plant and Equipment [Line Items]      
Number of vessels   2  
Ultramax Ice Class 1C [Member]      
Property, Plant and Equipment [Line Items]      
Number of vessels   2