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Margin Accounts, Derivatives and Fair Value Measures - Unrealized Gain (Loss) on Derivative Instruments (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Unrealized (loss) gain on derivative instruments $ 1,400,000 $ 0 $ 1,400,000 $ (2,900,000) $ 500,000 $ (300,000) $ 200,000 $ 2,300,000 $ (156,019) $ 2,753,834
Forward freight agreements                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Unrealized (loss) gain on derivative instruments                 (13,575) (89,820)
Fuel swap contracts                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Unrealized (loss) gain on derivative instruments                 274,646 2,843,654
Interest Rate Cap                    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                    
Unrealized (loss) gain on derivative instruments                 $ (417,090) $ 0