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Revenues - Summary of Analysis of Consolidated Statements of Operations (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 144,259,312	$ 164,330,202	$ 152,338,278
Time charter revenues - related party			1,973,643
Total revenues	144,259,312	164,330,202	154,311,921
Time Charter [Member]
Disaggregation of Revenue [Line Items]
Revenues	97,249,537	104,099,818	96,339,915
Bareboat [Member]
Disaggregation of Revenue [Line Items]
Revenues	21,764,102	24,646,311	27,647,268
Voyage Charter [Member]
Disaggregation of Revenue [Line Items]
Revenues	24,018,198	34,266,082	26,924,708
Other Income Revenues [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 1,227,475	$ 1,317,991	$ 1,426,387

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Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

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Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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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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