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Accounting policies - Basis of consolidation and Foreign currency (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 11, 2020 | Jan. 24, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Foreign Currency Transaction Gain (Loss), before Tax [Abstract] |  |  |  |
Foreign Currency Transaction Gain (Loss), before Tax |  |  | $ 68,818 | $ 71,923
Aerex |  |  |  |
Ownership interest acquired |  | 49.00% |  |
Ownership interest held |  | 100.00% |  |
Cash |  | $ 8,500,000 |  |
PERC Water Corporation |  |  |  |
Ownership interest acquired | 10.00% |  |  |
Ownership interest held | 61.00% |  |  |
Cash | $ 900,000 |  |  |

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