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Revenues - Summary of Analysis of Consolidated Statements of Operations (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenues	$ 164,330,202	$ 152,338,278	$ 136,539,399
Time charter revenues - related party		1,973,643	7,592,784
Total	164,330,202	154,311,921	144,132,183
Time Charter [Member]
Disaggregation of Revenue [Line Items]
Revenues	104,099,818	96,339,915	81,621,851
Bareboat [Member]
Disaggregation of Revenue [Line Items]
Revenues	24,646,311	27,647,268	29,422,512
Voyage Charter [Member]
Disaggregation of Revenue [Line Items]
Revenues	34,266,082	26,924,708	23,210,618
Other Income Revenues [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 1,317,991	$ 1,426,387	$ 2,284,418

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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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