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General Information General Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2020
USD ($)
numberOfVessel
vessel
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
vessel
Mar. 31, 2020
USD ($)
vessel
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
numberOfVessel
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
vessel
Dec. 31, 2020
USD ($)
numberOfVessel
vessel
Dec. 31, 2019
USD ($)
Sep. 28, 2020
Property, Plant and Equipment [Line Items]                        
Number of vessels 3                 3    
Number of dry bulk vessels financed under finance leases 4         4       4    
Number of vessels sold     1 2         1      
Loss on impairment of vessels | $ $ 0 $ 0 $ 1,800,000 $ 0 $ 4,800,000 $ 0 $ 0 $ 0 $ 1,800,000 $ 1,801,039 $ 4,751,143  
Panamax                        
Property, Plant and Equipment [Line Items]                        
Number of vessels 2                 2    
Ultramax Ice Class 1C                        
Property, Plant and Equipment [Line Items]                        
Number of vessels 2                 2    
Supramax                        
Property, Plant and Equipment [Line Items]                        
Number of vessels 7                 7    
Panamax Ice Class 1A                        
Property, Plant and Equipment [Line Items]                        
Number of vessels | numberOfVessel 6                 6    
Nordic Bulk Ventures Holding Company Ltd.                        
Property, Plant and Equipment [Line Items]                        
Ownership percentage                       66.67%
Nordic Bulk Ventures Holding Company Ltd. | Owner Of Deck Barge                        
Property, Plant and Equipment [Line Items]                        
Ownership percentage 50.00%                 50.00%