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Accounting policies - Additional Information (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 24, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2020
Foreign Currency Transaction Gain (Loss), before Tax [Abstract] |  |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  | $ 180,985 | $ 57,701 |  |
Contracts in progress |  |  |  |  |
Number of days after consumption billings are considered past due |  | 45 days |  |  |
Unsatisfied or partially unsatisfied performance obligations for contracts in progress |  | $ 3,200,000 |  |  |
Revenue expected to earn as it satisfies its performance obligations during the remainder of the year ending December 31, 2020 |  |  |  |  | $ 1,900,000
Revenue expected to earn as it satisfies its performance obligations after year ending December 31, 2020 |  |  |  |  | $ 1,300,000
Aerex |  |  |  |  |
Contracts in progress |  |  |  |  |
Ownership interest acquired | 49.00% |  |  |  |
Cash | $ 8,500,000 |  |  |  |
Ownership interest held | 100.00% |  |  |  |
Minimum [Member] |  |  |  |  |
Contracts in progress |  |  |  |  |
Number of days after consumption billings are collected |  | 30 days |  |  |
Maximum [Member] |  |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |  |
Percentage Of Bad Debts |  | 1.00% |  | 1.00% |
Contracts in progress |  |  |  |  |
Number of days after consumption billings are collected |  | 35 days |  |  |
Bahamas [Member] |  |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |  |
Deposits held in foreign bank |  | $ 9,800,000 |  |  |
Certificates of Deposit [Member] |  |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract] |  |  |  |  |
Cash Equivalents, at Carrying Value |  | $ 9,000,000 |  | $ 12,700,000 |

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