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Revenues - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenues	$ 145,003,021	$ 144,259,312	$ 164,330,202
Unearned revenue	1,353,290	439,135	821,577
Voyage Charters [Member]
Disaggregation of Revenue [Line Items]
Contract fulfilment cost	309,608	118,246
Voyage Charters [Member] | Demurrage [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 2,400,000	$ 2,000,000.0	$ 4,700,000

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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