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Commitments and Contingencies - Narrative (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 26, 2018
USD ($)
Jan. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
numberOfContract
numberOfVessel
Feb. 28, 2019
USD ($)
Dec. 31, 2020
USD ($)
vessel
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
numberOfContract
numberOfVessel
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
numberOfContract
numberOfVessel
Dec. 31, 2020
USD ($)
vessel
Dec. 31, 2019
USD ($)
Aug. 04, 2020
USD ($)
Commitments and Contingencies [Line Items]                                
Vessels useful life                           5 years    
Loss on sales of vessels         $ 0 $ 500,000 $ 300,000 $ (100,000) $ 4,600,000 $ 0 $ 0 $ 0   $ 730,065 $ 4,584,796  
Purchase of vessels                           $ 2,892,776 41,350,536  
Finance lease, weighted average remaining lease term       3 years                        
Noncancelable office lease period                           6 months    
Number of vessels | vessel         3                 3    
Contracted maximum selling price                         $ 32,000,000      
Contracted selling price at fair market value, percentage     0.85             0.85     0.85      
Vessel charter period                         15 years      
Purchase obligation     $ 2,500,000             $ 2,500,000     $ 2,500,000      
Time charter, term to completion                         15 years 30 days    
Lease, cost                           $ 200,000 200,000  
Investment in newbuildings in-process     $ 15,400,000   $ 15,390,635       $ 15,357,189 $ 15,400,000     $ 15,400,000 $ 15,390,635 $ 15,357,189  
Number of dry bulk vessels financed under finance leases     4   4         4     4 4    
Minimum                                
Commitments and Contingencies [Line Items]                                
Vessel lease term         20 days                 20 days    
Maximum                                
Commitments and Contingencies [Line Items]                                
Vessel lease term         83 days                 83 days    
m/v BULK DESTINY                                
Commitments and Contingencies [Line Items]                                
Sale leaseback transaction, gross proceeds                           $ 21,000,000.0    
Vessels useful life                           25 years    
Term of contract         7 years                 7 years    
Balloon payment to be paid         $ 11,200,000                 $ 11,200,000    
Basis spread on variable rate                           2.75%    
Interest rate, effective percentage         2.98%                 2.98%    
Vessels under finance lease         $ 24,000,000.0                 $ 24,000,000.0    
m/v BULK BEOTHUK                                
Commitments and Contingencies [Line Items]                                
Lease payable         $ 3,500                 $ 3,500    
Term of contract         5 years                 5 years    
Balloon payment to be paid         $ 4,000,000.0                 $ 4,000,000.0    
Interest rate, stated percentage         11.83%                 11.83%    
Repayments lease obligation   $ 5,500,000                            
Vessels under finance lease         $ 7,000,000.0                 $ 7,000,000.0   $ 4,600,000
m/v BULK TRIDENT                                
Commitments and Contingencies [Line Items]                                
Term of contract         8 years                 8 years    
Basis spread on variable rate                           1.70%    
Interest rate, effective percentage         1.93%                 1.93%    
Vessels under finance lease         $ 13,000,000.0                 $ 13,000,000.0    
m/v BULK PODS                                
Commitments and Contingencies [Line Items]                                
Basis spread on variable rate                           1.70%    
Interest rate, effective percentage         1.94%                 1.94%    
Vessels under finance lease         $ 14,800,000                 $ 14,800,000    
m/v Bulk PODS                                
Commitments and Contingencies [Line Items]                                
Term of contract         8 years                 8 years    
m/v BULK SPIRIT                                
Commitments and Contingencies [Line Items]                                
Term of contract       8 years                        
Balloon payment to be paid       $ 3,900,000                        
Purchase of vessels $ 13,000,000.0     $ 13,000,000.0                        
Finance lease, weighted average discount rate, percent       5.10%                        
Finance leases, minimum payments period       5 years                        
Bulk Friendship                                
Commitments and Contingencies [Line Items]                                
Purchase of vessels     $ 14,100,000                          
Finance lease, weighted average discount rate, percent     5.29%             5.29%     5.29%      
Purchase options, vessel     $ 7,800,000             $ 7,800,000     $ 7,800,000      
dwt DRY BULK                                
Commitments and Contingencies [Line Items]                                
Number of vessels | numberOfVessel     4             4     4      
Percentage of payment installment due, installment two     0.20             0.20     0.20      
Number of vessel newbuilding contracts | numberOfContract     2             2     2      
dwt DRY BULK | Minimum                                
Commitments and Contingencies [Line Items]                                
Purchase of vessels                         $ 37,700,000      
dwt DRY BULK | Maximum                                
Commitments and Contingencies [Line Items]                                
Purchase of vessels                         $ 38,300,000      
SINGAPORE                                
Commitments and Contingencies [Line Items]                                
Operating Lease, Weighted Average Remaining Lease Term         11 months                 11 months