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v3.21.2

General information and significant accounting policies (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Sep. 30, 2021 USD ($) item segment subsidiary | Sep. 30, 2020 USD ($) item | Dec. 31, 2020 USD ($)
Overview |  |  |  |
Number of operating segments | segment |  | 1 |  |
Number Of Vessels In Operation | item |  | 25 | 1 |
Average Age Of Vessels |  | 8 years |  |
Number of wholly owned subsidiaries | subsidiary |  | 79 |  |
Number of joint ventures | item |  | 1 |  |
Common stock |  | $ 363,839 |  | $ 352,067
Payments to Acquire Equity Method Investments |  | $ 5,112,593 | $ 0 |
Corporate Joint Venture [Member] |  |  |  |
Overview |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |
Marine LLC |  |  |  |
Overview |  |  |  |
Number of joint ventures | item |  | 1 |  |
Equity Method Investment, Ownership Percentage |  | 33.33% |  |
Element 1 Corp. Ardmore Shipping (Bermuda) Limited |  |  |  |
Overview |  |  |  |
Equity Method Investment, Ownership Percentage |  | 10.00% |  |
Common stock | $ 5,300,000 |  |  |
Payments to Acquire Equity Method Investments | $ 5,000,000.0 |  |  |
Ardmore Shipping Corporation [Member] |  |  |  |
Overview |  |  |  |
Equity Method Investment, Ownership Percentage |  | 100.00% |  |

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- Definition Average age of vessels, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8672-108599 + Details
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