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Commitments and Contingencies (Details Textual)
3 Months Ended 12 Months Ended
Apr. 30, 2017
USD ($)
Jan. 07, 2017
USD ($)
Jul. 05, 2016
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2013
vessel
Sep. 30, 2016
Commitments and Contingencies [Line Items]            
Proceeds from Legal Settlements $ 462,000          
rental expense per year under bareboat charter, next 5 years     $ 365,000      
Construction Of Two New ultramax newbuildings [Member] | Two Ultramax Vessels [Member]            
Commitments and Contingencies [Line Items]            
Purchase obligation, number of vessels | vessel         2  
mv BULK BEOTHUK [Member]            
Commitments and Contingencies [Line Items]            
Sale Leaseback Transaction, Lease Terms       The lease is payable at $3,500 per day every fifteen days over the five year lease term    
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid       $ 4,000,000    
Interest rate, stated percentage           11.83%
Capital Leased Assets, Gross       $ 7,000,000    
m/v Bulk Destiny [Member]            
Commitments and Contingencies [Line Items]            
Sale Leaseback Transaction, Proceeds   $ 21,000,000        
Sale Leaseback Transaction, Lease Terms       Minimum lease payments fluctuate based on three-month LIBOR and are payable quarterly over the seven year lease term    
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid   $ 11,200,000        
Debt Instrument, Basis Spread on Variable Rate   2.75%        
Debt Instrument, Interest Rate, Effective Percentage   3.85%        
Capital Leased Assets, Gross   $ 24,000,000