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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

X

- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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