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Significant Accounting Policies - Additional Information (Detail)		12 Months Ended
	Jan. 01, 2018 USD ($)	Dec. 31, 2018 USD ($) Segment	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Significant Accounting Policies [Line Items]
Allowance for doubtful accounts receivable		$ 0		$ 0
Impairment of assets, annual increase in undiscounted cash flows to determine fair value		1.00%
Impairment of assets, inflation rate for operating expenses used to determine fair value		1.50%
Disposal group, including discontinued operation		$ 0		0
Number of reportable segments | Segment		1
Number of operating segments | Segment		1
Company's opening retained earnings	$ 93,125,606	$ 80,849,086		93,469,787
Unearned revenue		0	$ 70,000	70,000
Other Current Assets [Member]
Significant Accounting Policies [Line Items]
Other current assets		$ 100,000
Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Company's opening retained earnings				$ (344,181)
Contract fulfilment cost	300,000
Effect of change [Member] | Accounting Standards Update 2014-09 [Member]
Significant Accounting Policies [Line Items]
Company's opening retained earnings	$ 300,000
LPG [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life		30 years
Product carriers [Member]
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life		25 years

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