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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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