Accounting policies - Goodwill and intangible assets (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Oct. 31, 2022	Sep. 30, 2022
Goodwill	$ 10,425,013		$ 10,425,013
Intangible assets, net	$ 3,401,666		2,959,166
Retail [Member]
Estimated Fair Value Carrying Amount Exceeded Percentage	32
Goodwill	$ 1,170,511		1,170,511
Bulk [Member]
Estimated Fair Value Carrying Amount Exceeded Percentage	51
Goodwill	$ 1,948,875		1,948,875
Services [Member]
Estimated Fair Value Carrying Amount Exceeded Percentage	15
Goodwill	$ 5,320,416		5,320,416
Intangible assets, net	$ 2,553,888		2,181,388
Manufacturing Units [Member]
Estimated Fair Value Carrying Amount Exceeded Percentage	15
Goodwill	$ 1,985,211		1,985,211
Intangible assets, net	$ 847,778		777,778
Discounted Cash Flow Method [Member]
Estimated Fair Value Percentage Segment Reporting Information	80.00%
Guideline Public Company Method [Member]
Estimated Fair Value Percentage Segment Reporting Information	20.00%
Aerex \| Manufacturing Units [Member]
Estimated Fair Value Carrying Amount Exceeded Percentage	15
Goodwill			1,985,211
Intangible assets, net			$ 777,778
PERC Water Corporation
Ownership interest acquired		39.00%

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

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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