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Transactions With Related Parties - Additional Information (Detail) - USD ($)			12 Months Ended
	Jan. 25, 2016	May 26, 2014	Dec. 31, 2018	Dec. 31, 2017	Dec. 12, 2017	Dec. 31, 2016
Related Party Transaction [Line Items]
Due to related parties, current, total			$ 7,930,642	$ 14,209,624
Revenue from related parties				$ 1,973,643		$ 7,592,784
The Manager [Member]
Related Party Transaction [Line Items]
Management fee, per day, per vessel			440
Management fee, per day, per vessel, under bareboat charter			$ 125
Vessel brokerage commission percentage			1.25%	1.25%		1.25%
Crew management fee, per month, per vessel			$ 2,500
Sales and purchase broker commission fee, percentage			1.00%
Due to related parties, current, total			$ 7,930,642	$ 14,209,624
The Manager [Member] | Additional Charge Per Day When Visits Exceed Five Days In Twelve Month Period [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			500
The Manager [Member] | Commission Fees Incurred And Capitalized To The Cost Of Vessels [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			1,598,858	525,978		$ 421,639
The Manager [Member] | Voyage Expenses Related Party [Member] | Brokerage Commission Fees [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			2,037,917		$ 1,912,505	1,772,240
The Manager [Member] | Management Fees Related Party [Member] | Management Fees [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			7,027,195	7,205,490		7,346,180
The Manager [Member] | Vessels Operating Expenses Related Party [Member] | Superintendent Fees [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			137,000	125,500		172,000
The Manager [Member] | Vessels Operating Expenses Related Party [Member] | Amounts Paid in Connection to Charter Agreements for the Vessels Operating Expense [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			0	675,408		2,969,843
The Manager [Member] | Vessels Operating Expenses Related Party [Member] | Crew Management Fees [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			377,500
The Manager [Member] | Net Gain on Sale of Vessels [Member] | Commission Expense Related to the Sale and Leaseback of Vessels [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			184,000	119,900		13,711
The Manager [Member] | General and Administrative Expense [Member] | Reimbursed Compensation [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			1,210,036	1,127,307		1,114,130
The Manager [Member] | General and Administrative Expense [Member] | Office Space Rent [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			84,686	82,192		72,907
The Manager [Member] | Impairment Loss [Member] | Commission Expense Related to the Sale and Leaseback of Vessels [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			212,650
Emihar Petroleum Inc [Member]
Related Party Transaction [Line Items]
Revenue from related parties			0	1,973,643		7,592,784
Brave [Member] | Vessel Construction Fee Per Vessel [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party	$ 490,000	$ 390,000
Brave [Member] | Capitalized Construction Supervision Fees [Member]
Related Party Transaction [Line Items]
Related party transaction, expenses from transactions with related party			$ 1,790,789	$ 535,864		$ 854,022

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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