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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
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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

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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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