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Summary of Significant Accounting Policies - Long-lived Assets Impairment Considerations (Details) - USD ($)
3 Months Ended 6 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
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]                      
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
Loss on sales of vessels $ 0 $ 500,000 $ 300,000 $ (100,000) $ 4,600,000 $ 0 $ 0 $ 0   $ 730,065 $ 4,584,796